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Sweet Potato Gratin

Sweet potato gratin is a wonderful baked and creamy side dish that is so easy to prep. Made with simple ingredients and perfect to serve with meat, chicken, seafood and veggie mains.

Prep Time
15 mins
Cook Time
15 mins
Total Time
50 mins
Servings: 6 servings
Calories: 333 kcal
Course: Side Dish
Cuisine: American

Ingredients

  • 1.5 lbs sweet potatoes about 2 -3 sweet potatoes, sliced thinly on a mandoline (⅛”)
  • 3 Tablespoon butter
  • ½ cup onion finely chopped
  • 3 - 4 garlic cloves finely minced
  • 1 cup heavy whipping cream
  • 1 Tablespoon arrowroot starch (or cornstarch)
  • Juice of ½ lemon
  • 1 cup Parmesan Cheese thinly grated
  • salt and pepper to taste
  • 1 teaspoon rosemary

Instructions

    Cup of Yum
  1. Preheat the oven to 400 F and grease the sides of a baking dish with butter or olive oil.
  2. Heat butter in a small skillet over medium high heat, add chopped onion, and saute until tender and translucent, about 2-3 minutes. Add minced garlic, and cook for 30 seconds until fragrant. Pour heavy whipping cream and stir. In a small bowl, make a slurry of the warm heavy cream and arrowroot starch. Add back to the skillet and stir well until sauce thickens. Turn off the heat and set aside.
  3. Place sliced sweet potatoes overlapping each other in one layer in the baking dish. Season with salt, pepper, and rosemary. Pour half of the onion mixture, and sprinkle ½ cup of the parmesan cheese on top.
  4. Place another layer of overlapping sweet potato slices on top. Season them with salt, pepper, and rosemary. Pour remaining onion mixture, and sprinkle remaining Parmesan cheese on top.
  5. Bake in a preheated oven for 30 - 40 minutes until the sweet potatoes are tender and cooked through. Let the sweet potato gratin cool for 5 - 10 minutes, and serve warm. The sauce will thicken as it cools.

Notes

  • Slice the sweet potato evenly so that everything cooks through. A mandolin is the easiest and quickest way to do this.
  • If needed, you can brown the top of the gratin under the broiler once it has baked.
  • The sweet potatoes should be fork tender once baked.
  • To make this vegetarian, use a parmesan cheese without rennet.

Nutrition Information

Calories 333kcal (17%) Carbohydrates 28g (9%) Protein 9g (18%) Fat 21g (32%) Saturated Fat 13g (65%) Cholesterol 67mg (22%) Sodium 397mg (17%) Potassium 453mg (13%) Fiber 4g (16%) Sugar 6g (12%) Vitamin A 16833IU (337%) Vitamin C 6mg (7%) Calcium 264mg (26%) Iron 1mg (6%)

Nutrition Facts

Serving: 6servings

Amount Per Serving

Calories 333

% Daily Value*

Calories 333kcal 17%
Carbohydrates 28g 9%
Protein 9g 18%
Fat 21g 32%
Saturated Fat 13g 65%
Cholesterol 67mg 22%
Sodium 397mg 17%
Potassium 453mg 10%
Fiber 4g 16%
Sugar 6g 12%
Vitamin A 16833IU 337%
Vitamin C 6mg 7%
Calcium 264mg 26%
Iron 1mg 6%

* Percent Daily Values are based on a 2,000 calorie diet.