Original Post: https://www.evolvingtable.com/sweet-potatoes-au-gratin/
Sweet Potatoes Au Gratin Recipe
A sweet and savory twist on a classic, this Sweet Potatoes au Gratin recipe is sure to steal center stage at your holiday or Thanksgiving table! Thin slices of sweet potatoes are coated in a creamy Gruyere cheese sauce, loaded with TONS herbs and earthy spice, and finished with a crunchy crumb topping that’s irresistible.
Servings: 8 servings
Ingredients
- 3 lbs. sweet potatoes cut into ⅛” slices
- 2 tsp. salt divided
- ½ tsp. black pepper
- 2 Tbsp. butter salted
- 2 Tbsp. flour all purpose or gluten-free 1-to-1 blend
- 4 cloves garlic finely minced
- 1 ½ cups milk regular or plant-based, room temperature.
- 1 cup Gruyere Cheese shredded
- 1 cup cheddar Cheese shredded
- 1 tsp. each of thyme and rosemary fresh
- ¼ tsp. nutmeg ground
Panko Parmesan Topping:
- 1 Tbsp. butter melted
- ¼ cup Panko crumbs or regular breadcrumbs
- ¼ cup Parmesan Cheese
Instructions
- Preheat the oven to 375 degrees.
- Prepare the Potatoes: Rinse and scrub the potatoes to remove any visible dirt. Dry thoroughly using a dish towel. Carefully cut the sweet potatoes into ⅛” slices using either a mandoline or a sharp chef’s knife.3 lbs. sweet potatoes
- Lay Potatoes in Baking Dish: Spray a 13x9-inch baking dish with non-stick cooking spray. Layer half of the sliced sweet potatoes in the bottom of the dish, sprinkle with ½ teaspoon salt and ¼ teaspoon of black pepper. Top with the remaining slices and another ½ teaspoon salt and ¼ teaspoon of black pepper2 tsp. salt, ½ tsp. black pepper
- Whisk the Sauce: Add the butter to a medium-sized saucepan over medium heat. Wait for it to melt before adding in the minced garlic cloves. Saute for 30-60 seconds, or until fragrant. Reduce heat to medium-low and sprinkle in the flour. Begin whisking immediately. Once it forms a thick paste, pour in ¼ cup of the room temperature milk, whisking well. When it thickens up, whisk in another ¼ cup of the milk and continue this process until all of the milk has been used and the sauce is smooth.2 Tbsp. butter, 2 Tbsp. flour, 4 cloves garlic, 1 ½ cups milk
- Mix in Cheese and Herbs: Remove the pot from the heat and add in the Gruyere cheese, cheddar cheese, fresh herbs, nutmeg, and remaining 1 teaspoon of salt. Whisk until the cheese is completely melted.1 cup Gruyere Cheese, 1 cup cheddar Cheese, 1 tsp. each of thyme and rosemary, ¼ tsp. nutmeg
- Cover and Bake: Pour the cheese sauce over the sliced potatoes in the baking dish, spreading it out using a spatula so all of the slices are coated. Cover the dish with aluminum foil and bake in the preheated oven for 30 minutes.
- Add Crumb Topping: While the potatoes are baking, toss together the crumb topping ingredients in a medium-sized bowl until well combined. Remove the foil from the dish and sprinkle the crumb topping evenly over the potatoes. Continue baking for an additional 15-20 minutes, or until the topping has browned slightly and the potatoes are fork tender.1 Tbsp. butter, ¼ cup Panko crumbs, ¼ cup Parmesan Cheese
- Serve sweet potatoes au gratin immediately with a sprinkle of finely chopped fresh rosemary and thyme.
Video
Notes
- Storage: Keep leftovers in an airtight container in the refrigerator for up to 4 to 5 days.
- Potatoes: Cut them equally thin so they cook at the same rate.
- Topping: Don't add the breadcrumbs right away or they'll burn.
- Cheese: You can sub a dairy-free cheese if necessary, or choose a different variety.
Nutrition
Calories: 372kcal | Carbohydrates: 44g | Protein: 14g | Fat: 16g | Saturated Fat: 9g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 4g | Trans Fat: 0.2g | Cholesterol: 46mg | Sodium: 903mg | Potassium: 643mg | Fiber: 6g | Sugar: 11g | Vitamin A: 24710IU | Vitamin C: 5mg | Calcium: 442mg | Iron: 2mg
