In this simple, cheesy sweet potato gratin recipe, sweet potatoes, gruyere, cheddar, garlicky cream, and fresh thyme come together to create a delicious twist on the classic potato au gratin casserole.
A cheesy sweet potato gratin
I would almost always choose sweet potatoes over regular potatoes, and this sweet potato gratin – a vibrant, seasonal twist on the classic potatoes au gratin casserole – is no exception.
It’s a simple recipe: layers of sliced sweet potatoes baked until bubbly in a garlicky cream sauce with a triple dose of cheesy goodness and fresh herbs; at its heart cozy comfort food that’s perfect for holiday entertaining and sure to become a seasonal favorite.
Here’s what you’ll need to make this gratin
This rich and cheesy sweet potato gratin combines mostly simple pantry ingredients with a couple of seasonal additions. Here’s what you’ll need to make it:
- sweet potatoes: of course! We’ll use vibrant sweet potatoes in place of traditional yellow potatoes. For the best texture, be sure to slice them very thin, no more than 1/8” thick.
- cheese: a blend of gruyére, sharp cheddar, and parmesan cheeses add tons of flavor, lots of creamy goodness, and forms the gratin or “crust” of the dish as it bakes.
- olive oil and garlic: the flavorful base of the creamy sauce.
- cream: for a rich and fully indulgent sauce that binds the scalloped sweet potatoes together.
- thyme and nutmeg: for cozy, earthy fall flavor.
- salt and pepper: be sure to season to taste!
Find all the exact measurements and full recipe instructions below.
Admittedly, slicing the potatoes takes a little bit of time (a mandoline is quite helpful for this), but after that, things come together quickly, and the gratin emerges from the oven golden and glorious and worth every ounce of effort. Happy cooking!!
Other cozy comfort foods to cook next:
- Simple homemade chicken ramen
- Lemony kale and white bean soup
- Pasta with broccoli and chicken sausage
- Butternut squash noodle soup
- Spinach and ricotta stuffed shells
If you make this sweet potato gratin recipe, be sure to tag me on Instagram with the hashtag #forkknifeswoon and leave a comment and rating below letting me know how you liked it! ★★★★★ Star ratings are especially helpful because they help others find my recipes too. xo, Laura
Originally published on December 11, 2012. Updated recipe photos by Jenn Davis added November 2018.