Step 1 of 8
Easy Sweet Potatoes Au Gratin
Preheat the oven to 375°F.
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Step 2 of 8
Easy Sweet Potatoes Au Gratin
Spray a 9-inch square baking dish liberally with nonstick cooking spray.
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Step 3 of 8
Easy Sweet Potatoes Au Gratin
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.
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Step 4 of 8
Easy Sweet Potatoes Au Gratin
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.
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Step 5 of 8
Easy Sweet Potatoes Au Gratin
Sprinkle the grated Parmesan and Gruyere cheeses in an even layer over the sweet potatoes.
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Step 6 of 8
Easy Sweet Potatoes Au Gratin
Bake the gratin on middle rack of oven until bubbling and browned on top, 40-45 minutes.
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Step 7 of 8
Easy Sweet Potatoes Au Gratin
Check to see that gratin is done. Remove from oven or add time as needed.
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Step 8 of 8
Easy Sweet Potatoes Au Gratin
Allow the dish to cool for 10 minutes. Plate and serve.