Sweet Potato Gratin
For years, it’s been a Thanksgiving (and Christmas!) tradition that I make a Gratin Dauphinoise for the Chief Taste Tester over here at Meatified HQ. The first year I made it, he had no idea what it was. His eyes practically rolled back in his head at first taste and every subsequent year he’d beg me to make a bigger pan so there would be leftovers. Then, we went Paleo. And not only were potatoes out, but so was the cream. Uh oh.
So I set about trying to come up with something which could take the carb and starch-fest’s place on the table at special occasions. At first I thought this would be easy: yay sweet potatoes! Yay coconut milk! Until I, of course, realized that coconut milk really doesn’t thicken too much on its own. Not to mention arrowroot is a pain in the butt due to the fact that it’s really not stable if you get it too hot. That wasn’t going to work in an oven dish.
So then I did some research and realized that heavy cream thickens because it has such a high fat content. Much higher, in fact, than coconut milk. So smartypants me thinks, “Easy! Add fats!”. This did – kind of – work. Aside from the fact that I added far too much coconut oil. While it was a pretty promising attempt, not only was it not thick or “creamy” enough, there was a really grody layer of sweet-potato-orange fat on the bottom of the dish. Not exactly appealing.
So then I attempted to outsmart myself. I needed less oil, but more thickening. So out went the coconut oil; in came a smaller amount of coconut butter. Then I recalled how pumpkin had helped me make an awesome paleo risotto not too long ago and I realized that would help round out the sauce and give more substance to the layers between the sweet potatoes. Genius! Now I just have to remind the Chief Taste Tester that he’s not getting this every weekend!
Here’s how to do it. Slice sweet potatoes to approximately 1/8th inch thick. Unless you have the patience of a saint, use a mandoline! I think I’d lose some digits if I tried to do this without one.
Thinly slice the shallot, too and set aside while you grease a 7×11 baking dish with oil of your choice. You can use a slightly larger dish if you need to, but this one works really well to get enough depth to the gratin. If you make it in a larger dish, you’ll have fewer layers so you’ll need to reduce the cooking time later. Place an overlapping layer of sweet potato slices on the bottom of the dish; alternate with sliced shallots.
Continue until all sweet potato and shallot slices are used up: this should make 4 layers of sweet potato (& 3 of shallots). Save the larger slices for the final layer.
Preheat oven to 400F while you make the sauce. Add coconut butter to a saucepan over very low heat (mine was 1/10); when melted, add almond flour. You’re basically making a paleo / starch free white sauce here.
Whisk almond flour into coconut butter until large crumbs are formed.
Add coconut milk in half cup increments, whisking each time to combine. There will be a few lumps which is fine!
Now you should have something which looks like a thin cream sauce. Too thin, actually.

Add seasonings and fresh herbs of your choice. I used thyme here, but sage would work beautifully – so would a combination! Stir in and keep things simmering.
Now it looks more pretty, but it’s still too thin.

Here’s where the magic happens! Add pumpkin and whisk until smooth.
Yay, your sauce is much thicker now! In fact, it’s just a tad thicker than cream would be, which is perfect. Turn up the heat to a low-medium and heat for a few minutes until sauce is warm and pourable.

Pour the sauce over the gratin dish, making sure the top is evenly covered. Yes, I should have taken a photo of this step. Oops. Bake in the oven for 30 – 40 minutes, uncovered, until the potatoes are cooked through and the top is brown. If you let this rest for 5 – 10 minutes when it comes out of the oven, it should slice perfectly!
- 2 lb sweet potatoes (about 2), peeled and sliced ⅛th inch thick
- 1 shallot, sliced thinly
- ¼ cup almond flour
- 2 tbl coconut butter
- 1½ cups coconut milk
- ⅔ cup pumpkin puree
- ½ tbl garlic powder
- Black pepper and fresh herbs of your choice to taste: sage, thyme or a combination are all fantastic!
- Slice sweet potatoes to approximately ⅛th inch thick. Unless you have the patience of a saint, use a mandoline! Thinly slice the shallot, too.
- Grease a 7×11 baking dish with oil of your choice.
- Place an overlapping layer of sweet potato slices on the bottom of the dish; alternate with sliced shallots. Continue until all sweet potato and shallot slices are used up: this should make 4 layers of sweet potato & 3 of shallots. Save the larger slices for the final layer.
- Preheat oven to 400F while you make the sauce.
- Add coconut butter to a saucepan over very low heat; when melted, add almond flour.
- Whisk almond flour into coconut butter until large crumbs are formed.
- Add coconut milk in half cup increments, whisking each time to combine. There will be a few lumps which is fine!
- Add seasonings and fresh herbs; stir in.
- Add pumpkin and whisk until smooth.
- Turn up the heat to a low-medium and heat for a few minutes until sauce is warm and pourable.
- Pour the sauce over the gratin dish.
- Bake in the oven for 30 – 40 minutes, uncovered, until the potatoes are cooked through and the top is brown.
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Please also note that meatified.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. As a result, this post does contain some affiliate links. For any purchases made using these, I receive a small percentage which goes towards covering the hosting costs of this site. Thank you for helping me out in this way so that I can continue to provide you with yummy recipes!





















Do you use canned coconut milk or the one that comes in a milk container?
Hi Sarah, I use the canned version as it seems to be thicker / creamier and the cartons often have sugar in them which I try to avoid.
Thanks! I was thinking the same about the sugar and I love full fat coconut milk. I can’t wait to make this for thanksgiving. It looks amazing. Thanks for sharing!
I almost changed my dinner plans on the spot when I saw this! Yum…
Bookmarking to try in the future!
Let me know how you like it, Alex! Honestly, I’m glad I’ve finished up all the leftovers because I could eat this on an obscenely regular basis if I let myself!
Yum, this looks amazing! I’ve been thinking about how to make a paleo gratin for awhile, so reading your write up was really helpful. I would love to make this for Thanksgiving!
Thank you so much! Glad to share my mistakes, too, they’re usually more helpful than the finished recipe, I find! I hope you enjoy this as much as we did
Perfect timing, had the husband pick up a few extras from the market this evening. Couldn’t resist….excited to try it for dinner tomorrow. yum!!
I’m thinking that layering ham in this would make it a great main dish. . .
This is an absolute keeper!!! I made this tonight to do a test run for Thanksgiving and it’s absolutely delicious & super easy to make! I noticed the ingredients call for fresh thyme and the print-instructions mention Sage in the steps. I had already intended to put Sage in this; I used both fresh Sage & fresh Thyme.
If anyone has read this recipe and is on the fence, don’t be! It’s amazing! If you’re going to make this for Thanksgiving, you’d probably want to double or triple the recipe because I can’t imagine this lasting very long on the table.
Thanks for sharing this great recipe!
Oooh, good catch, Yvette, thank you so much for pointing that out – I’ll make sure they match in just a second!
I’m so glad you liked it and thank you so much for taking the time to let me know!
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I made this last night, adding layers of ham, and my husband and 2 kids LOVED it. Great job!
Yay! Thank you for letting me know