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Crunchy Sweet Potato Gratin. Tender nutritious sweet potatoes cooked with a secret TIP! Topped with a crunchy-herb-Parmesan-nut crumble and broiled for 2 mins--the PERFECT side dish to make your meal shine! Get the recipe and the BEST way to cook sweet potatoes! Can be made Vegan! www.twopurplefigs.com

Crunchy Sweet Potato Gratin

My comforting Sweet Potato Gratin comes with a Crunchy Parmesan Crumble Topping. This simple yet elegant casserole recipe comes together in just 30 minutes and makes for the perfect side dish for Thanksgiving or any other festive occasion.

Course side
Cuisine American
Keyword casserole with parmesan topping, sweet potato gratin, vegan sweet potato casserole
Prep Time 5 minutes
Cook Time 25 minutes
Total Time 30 minutes
Servings 8 servings
Calories 169 kcal
Author Mahy


For the filling:

  • 2 medium sweet potatoes , washed, peeled and diced up to ½ inch pieces
  • 2 tablespoon butter or olive oil (for vegan)
  • 1 large shallot or 2 green onions
  • 1 teaspoon fresh rosemary
  • 1 pinch salt and pepper

For the topping:

  • 1/2 cup all-purpose flour
  • ¼ cup freshly grated parmesan cheese (skip if vegan)
  • 2 tablespoons fresh parsley minced
  • 6 Tablespoons butter or extra virgin olive oil(for vegan)
  • 1/4 cup crushed walnuts pecans or hazelnuts


  1. Preheat the broiler and set the rack on the second top shelf of the oven allowing 6-inch distance from the heating element.

  2. Heat a large deep skillet over medium-high heat and add the butter. Add the shallots and sauté over medium heat until tender.

  3. Add in the sweet potatoes and season well, then add the rosemary and toss everything well with the butter. Lower the heat to medium-low and cover the skillet.

  4. Cook until the sweet potatoes are tender, about 12 minutes. Remove from the heat.

  5. In a small bowl, mix the flour, parmesan parsley and season with salt and pepper. Then gently rub in the butter with your fingers until the mixture crumbles up with pieces of butter.
  6. Divide the sweet potatoes among 8 ramekins (or you can make this into one large gratin dish-2 quart capacity) and divide the crumbly flour mixture evenly on top of each ramekin. Divide and drizzle olive oil on top of each ramekin.
  7. Place the ramekins on a foil lined cookie sheet and broil 3-4 minutes until the tops are golden and crunchy.

Recipe Notes

Any vegetable may be substituted in this recipe for the sweet potato, or any combination of your choice as long as you adjust the cooking times for each. 

Alternatively, you may skip cooking the potatoes. Assemble the whole dish and place in the oven to roast at 425 degrees for about 30-35 minutes.

Nutrition Facts
Crunchy Sweet Potato Gratin
Amount Per Serving
Calories 169 Calories from Fat 108
% Daily Value*
Fat 12g18%
Saturated Fat 7g44%
Cholesterol 32mg11%
Sodium 172mg7%
Potassium 117mg3%
Carbohydrates 12g4%
Fiber 1g4%
Sugar 1g1%
Protein 2g4%
Vitamin A 4985IU100%
Vitamin C 0.7mg1%
Calcium 49mg5%
Iron 0.6mg3%
* Percent Daily Values are based on a 2000 calorie diet.