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Baked sweet potato casserole topped with parmesan cheese.
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5 from 5 votes

Sweet Potato Gratin

Sweet Potato Casserole made with cream and topped with Parmesan Cheese.
Prep Time20 mins
Cook Time2 hrs
Resting Time10 mins
Total Time2 hrs 30 mins
Course: Side Dish, Vegetable
Cuisine: American
Servings: 10 people
Calories: 293kcal
Author: Kathy


  • 3 pounds sweet potatoes
  • 2 cups heavy cream
  • 3 sprigs fresh thyme
  • 4 leaves fresh sage
  • 1 orange peel
  • ½ teaspoon salt
  • ½ teaspoon pepper
  • ¼ cup Parmesan Cheese Grated


  • Place cream. thyme, sage and orange peel in a sauce pan. Bring to a boil and turn off heat. Allow mixture to sit for at least 15 minutes allowing flavors infuse into cream. Strain mixture and set infused cream aside.
  • Peel and slice sweet potatoes into ⅛" slices.
  • Spray a casserole dish (3 ½ quart size) with non-stick cooking spray.
  • Layer ⅓ of the sweet potato slices in the bottom of the casserole dish, overlapping slices.
  • Sprinkle with salt and pepper.
  • Pour ⅓ of the infused cream over potatoes.
  • Repeat 2 times until all sweet potatoes and cream are used.
  • After final layer, press sweet potatoes down firmly in pan.
  • Cover with foil and place on a baking sheet. Place in a preheated 350 degree oven for one hour. Remove foil and continue baking for 45 minutes.
  • When sweet potatoes are cooked trough and the mixture is bubbly and browned, sprinkle on Parmesan cheese. Return to oven for 15 minutes.
  • Allow casserole to rest for 10-15 minutes before serving.



  • Only use the outer peel from the orange. Do not use the white pith, which is bitter. 
  • Use a vegetable peeler to remove the orange peel in long strips.
  • Use a mandoline to make uniform sweet potato slices
  • Bake casserole on a baking sheet. This makes easy clean up if your casserole spills over while baking.
  • Garnish with fresh thyme before serving. 
To make ahead of time:
  • Bake up to one day ahead to the step of adding the Parmesan cheese.
  • Reheat, uncovered in a 375 degree oven until bubbly, about 20 minutes.
  • Add cheese and bake 10 more minutes. 


Calories: 293kcal | Carbohydrates: 29g | Protein: 4g | Fat: 18g | Saturated Fat: 11g | Cholesterol: 67mg | Sodium: 249mg | Potassium: 494mg | Fiber: 4g | Sugar: 6g | Vitamin A: 20044IU | Vitamin C: 6mg | Calcium: 105mg | Iron: 1mg