Sweet Potato Au Gratin

5 from 7 votes

If you are looking for the ultimate fall side dish, make Sweet Potato Au Gratin. It is loaded with savory flavor that is easy to make with simple ingredients.

Prep Time25

Cook Time1

Let the dish rest10

Total Time1 35

Course: Side Dish

Cuisine: American

Servings:

Author: Carrie Barnard

Cost: $9.60 Recipe, $1.20 per Serving

Ingredients

3 pounds sweet potatoes peeled and sliced 1/8 inch thick
2 cups heavy cream
2 cloves garlic minced
1 teaspoon salt
½ teaspoon black pepper
¼ teaspoon ground nutmeg
1 ½ cups grated Gruyere cheese
1 cup grated sharp cheddar cheese
2 tablespoons unsalted butter cut into small pieces

Instructions

Preheat the oven to 375°F. Grease a 9×13-inch baking dish.
In a large saucepan, combine the heavy cream, garlic, salt, black pepper, and nutmeg. Heat over medium heat until the mixture just begins to simmer, then remove from the heat.
Arrange half of the sliced sweet potatoes in the prepared baking dish, slightly overlapping the slices.
Pour half of the cream mixture evenly over the sweet potatoes. Sprinkle with half of the Gruyere and half of the cheddar cheese.
Repeat with the remaining sweet potatoes, cream mixture, Gruyere, and cheddar. Top evenly with the pieces of butter.
Cover the baking dish tightly with aluminum foil and bake for 30 minutes.
Remove the foil and bake for an additional 25–30 minutes, until the sweet potatoes are fork-tender and the top is golden brown and bubbly.
Let rest for 10 minutes before serving.

Notes

Try to slice the sweet potatoes as evenly as you can (about 1/8 inch thick) so they cook evenly. A mandoline slicer makes it super quick and easy, but if you're slicing by hand, just take your time to keep the thickness the same.

When heating the heavy cream, only bring it to a light simmer. Avoid boiling the mixture, as it may reduce too much or cause the cream to separate. If your cream thickens too much while simmering, remove it from heat earlier.

When layering the sweet potatoes, try to slightly overlap each slice. This helps the dish stay compact and ensures that each bite has layers of the sweet potato and cheese.

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