Sweet Potato & Kale Gratin Recipe (2024)

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A rich, creamy gratin made with sweet potatoes and kale. Perfect for the holidays!

This was a sponsored post with Brandfluential for Organic Valley back in 2012. It has since been updated. All opinions are my own.

I feel like I've written about all my failed Thanksgiving sweet potato attempts several times already (or maybe it just feels that way?) and I really don't want to bore you with yet another story about those sweet potato failures, but I'm going to do it anyway.

Because without those failures this Sweet Potato & Kale Gratin would not exist! (And after this, I will have written about each one of my sweet potato failures, so you won't have to hear about them again. Promise.)

My very first idea for a sweet potato side was a gratin. I had this fabulous idea for a recipe involving fresh rosemary and cheese and I just knew it was going to be delicious.

But I was a little too sure of myself and I thought, "I bet I can make this lighter! I'm going to use milk instead of heavy cream!"

You guys? If you're making a gratin, don't use milk. Oh sure, it works some of the time. But the other times, you have a curdled gratin. That curdled gratin might taste good, but it is quite literally a hot mess. A greasy hot mess.

My husband reassured me that it tasted good, but it looked like something that would be served to prison inmates.

When you're cooking for the holidays, you don't want to run the risk of a gross looking sweet potato gratin. And it's the holidays! The time of the year when you can get away with using heavy whipping cream!

So this is my redemption gratin. I used Organic Valley Heavy Whipping Cream to make it. No curdled sweet potato gratin this time!

I also decided to replace the rosemary with nutmeg for a more traditional sauce and then because I can never bear to do anything completely traditional, I used fewer sweet potatoes and replaced them with kale. (Yes, kale! I can't get enough kale and sweet potatoes!)

With a rich side dish like this one, the addition of greens helps lighten things up a little bit.

Organic Valley is a brand that I use often in my cooking, so when I had the chance to develop this recipe for them, I was pretty excited about it.

I try to be mindful of what I put in my grocery cart, and when it comes to dairy, things like hormones and antibiotics are a concern for me, which is why I like Organic Valley.

And when I buy produce, I buy organic when possible in order to avoid pesticides--well, did you know that dairy can also contain pesticides? Organic Valley products don't; the pastures that their cows graze on are free of pesticides, herbicides, and fertilizers.

Those are the reasons I've bought Organic Valley in the past, but in working with them on this post, I learned a new reason to buy from them in the future: Organic Valley is a farmer-owned cooperative, helping small family farmers thrive in an era of agribusiness. How cool is that?

More Tasty Ideas

If you love this sweet potato and kale bake, be sure to check out these other delicious ideas:

  • Creamy Vegan Mashed Potatoes
  • Vegan Green Bean Casserole
  • 45+ Vegetarian Thanksgiving Main Dishes

If you're here planning your holiday menu, don't miss our new Vegan Christmas and Vegan Thanksgiving cookbooks. They're packed with all my favorite holiday-worthy recipes for a plant-based feast.

Recipe

Sweet Potato & Kale Gratin Recipe (7)

Sweet Potato & Kale Gratin

A rich, creamy gratin made with sweet potatoes and kale. Perfect for the holidays!

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Prep Time: 20 minutes minutes

Cook Time: 50 minutes minutes

Total Time: 1 hour hour 10 minutes minutes

Course: Side Dish

Cuisine: American

Diet: Vegetarian

Keyword: gratin recipe, Sweet Potato & Kale Gratin

Servings: 10 -12 servings

Calories: 418kcal

Author: Oh My Veggies

Ingredients

  • 1 lb. kale tough stems removed and leaves torn into bite-sized pieces
  • 3 lbs. sweet potatoes peeled and thinly sliced (mine were between ⅛ and ¼-inch - you can use a mandoline slicer)
  • 1 c. shredded Organic Valley Parmesan cheese
  • 1 pint Organic Valley heavy whipping cream
  • 1 tsp. salt
  • ½ tsp. Black Pepper
  • ½ tsp. ground nutmeg
  • 2 tbsp. Organic Valley salted butter cut into small pieces, plus more to grease baking dish

US Customary - Metric

Instructions

  • Preheat oven to 400 degrees.

  • Steam kale for about 3 minutes, or until wilted, in a large steamer basket set over boiling water. Remove from heat and allow to cool slightly. Squeeze out excess water.

  • Place half of the potatoes in a greased 9 x 13 baking dish. (You don't have to do this neatly, but try to make sure each layer is even!) Top potatoes with kale, then top kale with half of the Parmesan cheese. Place remaining potatoes in dish and sprinkle with the rest of the cheese. Whisk together whipping cream, salt, pepper, and nutmeg and pour over potatoes. Dot with butter.

  • Cover baking dish with aluminum foil and bake for 25 minutes. Remove foil and bake for 20-25 minutes more, or until potatoes are tender and cheese is golden brown. Allow to sit 15 minutes before serving.

Notes

To make this more of an everyday side dish, you can use whole milk in place of the heavy whipping cream, but this increases the likelihood of the gratin curdling. If the gratin curdles, don't panic! It is still perfectly fine to eat, it just doesn't look very pretty.

Nutrition

Calories: 418kcalCarbohydrates: 34gProtein: 14gFat: 27gSaturated Fat: 16gPolyunsaturated Fat: 1gMonounsaturated Fat: 7gTrans Fat: 1gCholesterol: 87mgSodium: 701mgPotassium: 743mgFiber: 4gSugar: 6gVitamin A: 24793IUVitamin C: 58mgCalcium: 422mgIron: 2mg

Craving more veg-friendly recipes? Shop our collection of vegetarian and vegan cookbooks, including our new Vegan Thanksgiving and Vegan Christmas cookbooks!

« Pumpkin Vegetarian Sausage Rolls

Black Forest Cheesecake Trifles »

Reader Interactions

Comments

  1. Anele @ Success Along the Weigh says

    Yum, that looks awesome!

    Reply

  2. Brian @ A Thought For Food says

    I made my first gratin not too long ago and had a moment of weakness... hovered over the stove, a fork in my hand... it was not my proudest moment, but it sure was delicious! This gratin has everything I love... sweet potatoes, lots of cream, cheese, and kale! Loving that addition there.

    Reply

    • Kiersten says

      If I didn't have to take photos, I would have been right there doing the same thing!

      Reply

  3. Sommer@ASpicyPerspective says

    So pretty and comforting! Adding this to my holiday menu. 🙂

    Reply

    • Kiersten says

      Yay! I wanted to come up with something that would be perfect as part of a holiday dinner spread. 🙂

      Reply

  4. Rachel @ Following In My Shoes says

    This looks AMAZING -- seriously. Your pictures are so beautiful... and I have sweet potatoes in my pantry. I think I know how they'll be used!

    Reply

    • Kiersten says

      Thank you! And you like kale too, right? So it's perfect! 🙂

      Reply

      • Rachel @ Following In My Shoes says

        Heck yeah! I lurrrrve kale.

        Reply

  5. Liz @ A Nut in a Nutshell says

    I die. I absolutely die.

    Reply

  6. Liz @ A Nut in a Nutshell says

    PS. I like the looks of the giveaway entry thing you're using. Which one is that?

    Reply

    • Kiersten says

      It's a Wufoo contact form. You have to pay for it, but I really wanted to do a form entry. I've had readers tell me they don't understand how to use Rafflecopter and a lot of people don't like leaving comments either. This is the first one I'm doing like this, so we'll see how it goes!

      Reply

  7. Maria Tadic says

    This looks like a delicious recipe! If you want to lighten up dishes with heavy cream, you could sub in evaporated milk - not the skim, but 1% works really well. Use the same amount as the heavy cream and you still get a thick creamy texture without all the extra saturated fat! A little tip from a dietitian/chef I worked with!

    Reply

    • Kiersten says

      Thanks for the tip! 🙂

      Reply

  8. Robin (Masshole Mommy) says

    Looks and sounds fantastic. I'm a huge kale fan, so I definitley want to try this!

    Reply

  9. Jessi says

    This is really brilliant!

    Reply

  10. Genevieve says

    Glad you were able to create a sweet potato dish that worked out so well! My family likes scalloped potatoes as a side dish at holiday gatherings, but I would definitely prefer sweet potatoes, especially when kale is included too!

    Reply

    • Kiersten says

      I haven't had scalloped potatoes in SO long! I had an idea for those that I was going to do this month, but I did a potato recipe last week, so I figured I better wait or people will be potatoed out. 🙂

      Reply

  11. trisha says

    You make vegis look good. Can you come over?'

    trisha

    Reply

    • Kiersten says

      But they are good! They really are!

      Reply

      • trisha says

        I actually really do love vegis, but sweet potatoes have never been a favorite of mine. I like old fashioned vegis like broccoli and stuff. Green stuff. Ive been trying to get into the sweet potatoes and made them this year w/ bourbon. I was like....nah. Give me a fork and some lettuce.

        Reply

        • Kiersten says

          A lot of people seem to not like sweet potatoes. Maybe it's the sweetness? Or the texture? I'm actually picky about vegetables too, believe it or not. I've never even eaten a raw tomato. 😛

          Reply

  12. Angie@Angie's Recipes says

    A wholesome veggie treat! I have never prepared, let alone had, a gratin with this combo..sweet potato and kale...a perfect match made in heaven!

    Reply

    • Kiersten says

      It's not exactly traditional, but like I said, I can never do things the traditional way. 😉

      Reply

  13. Danielle says

    Any recommendations (other than vegan cheese) for making this vegan? Any suggestions for an exchange for the cream?

    Reply

    • Kiersten says

      I wouldn't attempt to use a non-dairy milk--I don't think it will be thick enough. Instead, I'd use cashew cream. You might have to keep the casserole covered a little bit longer (maybe even the whole baking time?) to make sure the cashew cream doesn't get too thick or harden, though. I've had mixed results baking it!

      Reply

      • Danielle says

        Thanks!!

        Reply

  14. Cassie | Bake Your Day says

    This is amazing. we love sweet potatoes!

    Reply

  15. claire @ the realistic nutritionist says

    this is so pretty!!

    Reply

  16. Shannon says

    I have not yet tried kale but want to and this looks SOOOO delicious! Yum!

    Reply

    • Kiersten says

      Thank you! I really love kale--the texture is better than spinach and the taste is milder than other greens.

      Reply

  17. Alison @ Ingredients, Inc. says

    I am putting this on my holiday menu list!

    Reply

    • Kiersten says

      It is so perfect for the holidays! 🙂

      Reply

  18. Bernadette @ Now Stir It Up says

    This looks great. I love using oragnic milk/cream etc. It always lasts longer too.

    Reply

    • Kiersten says

      I never noticed that it lasts longer. I guess I use it all up too quickly! 😉

      Reply

  19. kirsten@FarmFreshFeasts says

    How delicious--thanks!

    I've made Smitten Kitchen's gratin with swiss chard, but I'm getting kale in the farm share and have some mixed greens put up, so I will try this with one of them!

    Reply

    • Kiersten says

      I love the idea of making a gratin with Swiss chard! Well, this recipe would definitely work with any kind of greens, I think. I just happen to be partial to kale. 🙂

      Reply

  20. Ashley - Baker by Nature says

    I feel like I just can't get enough when it comes to sweet potatoes and kale! I love love love this dish... it might even be at our party this weekend.

    Reply

    • Kiersten says

      Me neither. I have so many sweet potato & kale recipes on my blog. When I find something I like, I really latch onto it! 🙂

      Reply

  21. Hannah Healy @ Healy Real Food Vegetarian says

    This looks soo yummy! It would be a great side dish for Christmas!

    Reply

  22. Stephanie @ henry happened says

    How smart are you to use sweet potatoes and kale! I'm pretty sure it cancels out the heavy whipping cream. And I spotted the napkin! That's my 1 and only food photography prop 🙂

    Reply

    • Kiersten says

      Ha! Well, you have good taste then. 😉 I need to buy some more props. I'm starting to think people are going to notice that I always use the same forks and that I have exactly 5 napkins that I use on a rotating basis.

      Reply

  23. Natalie @ Once Upon a Cutting Board says

    I had a similar experience trying to use milk in a chowder recently and it just got all curdled and gross looking, but still tasted good! I love the looks of this gratin and that you added kale!

    Reply

    • Kiersten says

      Yup, I've had that happen with soups too. I always try to lighten things up and use lower fat dairy, but apparently that makes things more prone to curdling. 🙁

      Reply

  24. Katherine says

    This looks amazing!

    Reply

  25. Mumseword says

    New dish on my christmas must cook list! =)

    Reply

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Sweet Potato & Kale Gratin Recipe (2024)

FAQs

Why do you soak sweet potatoes before baking? ›

The cold water bath helps rinse the starch off the sweet potatoes so they're a bit more crispy. That said, if you do not have the time, you can still get crispy baked sweet potato fries by using high heat and a little drizzle of olive oil.

How do you make sweet potato casserole not watery? ›

If your sweet potato casserole turned out “watery”, its usually because you forgot to add eggs; you didn't let your casserole have enough time to set up after baking or you used fresh sweet potatoes and didn't boil them long enough before mashing.

Why is boiled sweet potato better than baked? ›

Boiled sweet potatoes affect blood sugar levels far less than other varieties, such as fried, roasted, or baked versions. Longer boiling times reduce the GI further. To support better blood sugar control, it's best to select healthy cooking methods and enjoy sweet potatoes in moderation.

Why do sweet potatoes poke holes before baking? ›

Do you have to poke holes in sweet potatoes before baking? Typically holes are poked into a sweet potato to prevent a potato exploding in your oven. However, the chance of that happening is low, and according to Lifehacker, sweet potatoes will retain more flavor if you don't poke them.

Should sweet potatoes be peeled before baking? ›

Whether or not you peel the potato is completely personal preference; we leave ours on as I enjoy the texture. If you are serving children or sensitive eaters, consider peeling the sweet potatoes before roasting. Cut Uniform-ish Pieces.

How long to soak sweet potatoes to remove starch? ›

Transfer to a bowl filled with ice and water and let it soak for 30 minutes. The cold water helps with removing excess starch and crisping up the potatoes later. The longer it sits in the ice, the better.

Why put egg in sweet potato casserole? ›

The egg is the all-important binder in a sweet potato casserole: it enriches and stiffens the mixture without making it heavy. Make sure to cool the mash slightly before adding the egg so it doesn't scramble, and to stir well so there are no streaks of cooked egg white in the finished dish.

Why are my sweet potatoes still hard after baking? ›

If the potato is still firm when squeezed, that means it needs to cook more. Baked sweet potatoes can be stored in an airtight container in the refrigerator for up to 5 days. Reheat for 2 minutes in the microwave, at 400°F in the air fryer for 5 minutes, or at 400°F in the oven for 10 minutes.

Do sweet potatoes spike blood sugar? ›

Sweet potatoes are a source of carbohydrates, which raise blood sugars,” says White. “People with diabetes can eat carbs but need to watch portions of foods with carbs.” What this means: Limit portions to half a sweet potato per meal or snack.

Are sweet potatoes anti-inflammatory? ›

Antioxidants Aplenty

Purple-fleshed sweet potatoes are thought to contain super-high levels of antioxidant and anti-inflammatory agents. As these substances pass through your system, they balance out free radicals -- chemicals that harm your cells.

What is the healthiest way to eat a sweet potato? ›

Therefore, from a nutritional standpoint, boiling rather than baking should be recommended for cooking sweet potato. Boiling may theoretically be best, but sweet potatoes are so incredibly healthy that the actual best way to prepare them is whichever way will get you to eat the most of them!

Is it better to wrap sweet potatoes in foil when baking? ›

Wrapping sweet potatoes in foil helps in a few ways. It prevents the exterior of the tuber from drying out and overheating too quickly, which would minimize enzymatic activity; it also results in a more evenly cooked texture.

What temperature is a baked sweet potato done at? ›

If you'd like a more precise indicator, insert an instant-read thermometer into the thickest part of the sweet potato. The internal temperature of a cooked sweet potato should read between 205- and 212-degrees Fahrenheit.

Why are some sweet potatoes stringy inside? ›

These "strings" come from growing a potato in soil that is too fertile. The potato is a root and roots store nutrients. Grown in soil that is too fertile, sweet potato vines will grow fast and big and the result is long stringy roots (or potatoes).

What's the point of soaking potatoes before cooking? ›

Soaking potatoes in water helps remove excess starch. Excess starch can inhibit the potatoes from cooking evenly as well as creating a gummy or sticky texture on the outside of your potatoes. Cold water is used because hot water would react with the starch activating it, making it harder to separate from the potatoes.

Should you soak potatoes in salt or sugar water? ›

The best potatoes for French fries are soaked in a sugar solution before frying. The sugar solution has something to do with the carbohydrates and prevents the potatoes from soaking up a lot of grease, so they get crunchy.

Should I put sweet potatoes in water before baking? ›

Give them a cold water bath: Once your fries are chopped, toss them into a large bowl. Then cover the fries completely with cold water and let them soak for at least 30 minutes (or up to overnight). This will help to rinse off the excess starch and help the potatoes crisp up beautifully in the oven.

What happens when you soak a potato in sugar water? ›

As the amount of sugar solution increases in the other containers, the mass of the potato cores goes down. If the water is highly concentrated with sugar, the water actually leaves the potato because there is a higher concentration of pure water in the potato than there is in the sugar water.

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