Recipe Video - OnlineCook

April 29, 2025

Put a twist on traditional potatoes au gratin by using nutrient-dense sweet potatoes instead! The recipe is a Yummly original created by Sara Mellas.

9 Ingredients

Recipe

Easy Sweet Potatoes Au Gratin

OnlineCook

Ingredients

Servings

Warning0 allergens identified

Instructions

Preheat the oven to 375°F.

Spray a 9-inch square baking dish liberally with nonstick cooking spray.

Peel the sweet potatoes and slice uniformly about 1/8-inch thick. Arrange the slices in the pan in rows, slightly overlapping one another. Sprinkle salt and black pepper over the sweet potatoes.

Pour the heavy cream into a large measuring cup. Add the thyme leaves and nutmeg. Whisk to combine. Pour the mixture over the sweet potatoes.

Sprinkle the grated Parmesan and Gruyere cheeses in an even layer over the sweet potatoes.

Bake the gratin on middle rack of oven until bubbling and browned on top, 40-45 minutes.

Check to see that gratin is done. Remove from oven or add time as needed.

Allow the dish to cool for 10 minutes. Plate and serve.

Video Tutorial Bite Tutorial

Smart Nutrition

Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

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Tips & Tricks (5)

Mandoline Magic 🔪
Use a mandoline slicer to create uniformly thin, consistent sweet potato slices that cook evenly and look professionally prepared.
Cheese Layering Technique 🧀
Alternate layers of sweet potatoes with cheese to ensure every bite has maximum cheesy goodness and prevents cheese from burning on top.
Cream Temperature Trick 🥛
Warm the heavy cream slightly before adding to the dish to help it absorb more quickly and create a smoother, more luxurious texture.
Nutmeg Elevation 🌿
Freshly grate nutmeg instead of using pre-ground to unlock its full aromatic potential and add a more complex, vibrant flavor profile.
Crispy Top Secret 🔥
Finish the dish under the broiler for 2-3 minutes to create a golden, crispy cheese crust that adds textural contrast to the creamy sweet potatoes.