Thinly sliced layers of sweet potato baked in a creamy, cheesy sauce until tender with a golden brown top. These are a little sweet, a little savory and full of herbs and aromatics. The perfect side dish for holiday dinners.
2lbssweet potatoesweight is after sweet potatoes have been peeled and sliced
3ozromano cheese grated
Instructions
Make the Cream Sauce
Whisk all ingredients for cream sauce together in a pitcher or small pot. Set aside
Making Sweet Potato Au Gratin
Preheat the oven to 400°F then spray a 10x7 casserole dish with non-stick cooking spray. Ladle a small amount of cream sauce into the dish to lightly cover the bottom
Peel the sweet potatoes then slice them to ⅛ inch thick on the mandolin slicer
Layer the sweet potatoes in the bottom of the pan slightly overlapping each other. Stir the cream then ladle a small amount of cream sauce over the potatoes and sprinkle them lightly with Romano cheese
Begin the next layer of sweet potatoes placing them in the opposite direction of the first layer. Ladle them with cream then a light sprinkle of Romano
Continue this process until all potatoes and cream are used up. Press the potatoes down so that the cream covers the top of them
Sprinkle the remaining Romano over the top of the dish then bake for 40 minutes, uncovered
Place aluminum foil over the top of the dish then continue baking another 15 minutes
Remove the sweet potato au gratin from the oven and allow to cool for about 30 minutes to set. Serve warm or at room temperature
Notes
Make sure to press the sweet potatoes down under the cream mixture a couple times during the layering and at the end. You want the cream to slightly cover the top of the potatoes.
The cream sauce will taste salty. That's okay, the potatoes will soak that all up and it will not be salty after it's cooked.
For the best results, give the cream mixture a stir right before each addition. The garlic sinks to the bottom and this makes for more evenly distributed flavor.
You can make this Homemade Sweet Potato Au Gratin up to 3 days ahead of time.