Sweet Potatoes Au Gratin

Sweet Potatoes Au Gratin is a creamy, cheesy dish made with thinly sliced sweet potatoes, heavy cream, garlic, nutmeg, and Cheddar cheese. It’s a perfect, indulgent side for any occasion. 

Sweet Potatoes Au Gratin is a rich and indulgent dish that is perfect for any occasion. Whether it's a weeknight dinner or a holiday feast, this creamy, cheesy, and comforting side will steal the show. The dish combines thinly sliced sweet potatoes with a luscious cream sauce, infused with garlic and nutmeg, and topped with melted Cheddar cheese. It’s a twist on the classic potato au gratin but with the naturally sweet and earthy flavor of sweet potatoes. Below is my recipe for Sweet Potatoes Au Gratin, along with helpful tips, variations, storage instructions, and serving suggestions to help you get the most out of this incredible dish.

Video Tutorial

Sweet Potatoes Au Gratin Recipe

Ingredients:

• 1 ¾ cups heavy cream (approximately 435 ml)
• 2 garlic cloves, minced
• 2 tbsp unsalted butter, melted
• 2 ½ lbs. sweet potatoes, peeled and thinly sliced (3 mm thick)
• 1 tsp salt
• ¼ tsp black pepper
• ¼ tsp. of nutmeg
• 2 ½ cups grated Cheddar cheese

Instructions:

1. Prepare the sweet potatoes: Peel the sweet potatoes and slice them thinly, about 3 mm thick. The thinner the slices, the more evenly the potatoes will cook, ensuring a tender texture throughout. Use a mandolin or sharp knife.

2. Prepare the cream mixture: In a jug, combine the heavy cream, melted butter, minced garlic, nutmeg, salt, and pepper. Stir well to combine the ingredients into a smooth mixture.

3. Assemble the dish: Start layering your sweet potato slices in a baking dish. Begin with ⅓ of the sweet potatoes, spreading them evenly across the bottom. Pour over ⅓ of the cream mixture and sprinkle with ¾ cup of grated Cheddar cheese. Repeat the layering process for the second and third layers, ensuring that each layer is evenly coated with the creamy mixture and topped with cheese.

4. Bake covered: Cover the dish with foil or a lid and bake for 1 hour. Check the sweet potatoes with a knife to ensure they’re tender. If they are not soft, bake for an additional 15 minutes.

5. Add cheese and finish baking: Remove the foil, then sprinkle the remaining cheese on top. Bake for another 10–15 minutes, uncovered, until the top is golden and bubbly.

6. Serve: Let the dish rest for about 5 minutes before serving. If you like, garnish with your favorite finely chopped herbs like fresh thyme or rosemary for an added burst of freshness.

Helpful tips and recipe variations

While the Sweet Potatoes Au Gratin recipe is fairly straightforward, there are a few tips and variations that can elevate the dish:

Tips:

1. Use a mandolin slicer to slice the sweet potatoes uniformly. This ensures that they cook evenly and consistently, resulting in a perfectly smooth texture.
2. Seasoning: While the recipe uses nutmeg, salt, and pepper, you can experiment with other seasonings like paprika, thyme, or garlic powder to enhance the flavor profile. A pinch of cayenne pepper can add a touch of heat for those who enjoy a little spice.
3. Cheese choices: While Cheddar is the classic choice, feel free to mix in other types of cheese for added complexity. Gruyère cheese, sharp cheddar, or Parmesan adds a delightful nuttiness, while a bit of mozzarella will melt beautifully and make the dish extra gooey. 
4. Cream substitutes: If you're looking for a lighter version, you can replace some of the heavy cream with half-and-half or milk. However, this will slightly change the richness of the dish. For a dairy-free alternative, you could use coconut cream, though the flavor will change.

Variations:

1. Add-ins: For extra flavor and texture, consider adding cooked bacon bits, sautéed onions, or fresh herbs between the layers. Mushrooms also pair wonderfully with sweet potatoes, adding an earthy depth to the dish. You can also add some Gruyere or Parmesan cheese for extra flavor.
2. Sweet potato and regular potato mix: If you enjoy the sweetness of the sweet potatoes but also want the heartiness of regular russets, try a half-and-half mix. This will still give you that creamy texture with a slightly different flavor balance.
3. Vegan version: To make this dish vegan, swap out the heavy cream for a plant-based cream or full-fat coconut milk, use dairy-free butter, and choose a vegan cheese that melts well.

How to store and reheat Sweet Potatoes Au Gratin

If you find yourself with leftovers (lucky you!), storing and reheating Sweet Potatoes Au Gratin is easy, so you can enjoy this delicious dish for several days.

Storing:

Allow the dish to cool to room temperature before storing it in an airtight container in the refrigerator. It will stay fresh for up to 3 days. The dish can be made in advance and stored in the fridge overnight if you’re planning ahead for a dinner party or holiday meal.

Reheating:

When reheating Sweet Potatoes Au Gratin, it’s best to bake it in the oven for the best results. Preheat your oven to 350°F (175°C) and cover the dish with foil to prevent it from drying out. Bake for 15–20 minutes until heated through, then uncover and bake for an additional 5–10 minutes to crisp up the top layer of cheese.

Alternatively, you can reheat individual servings in the microwave. Place a portion in a microwave-safe dish and cover it loosely with a paper towel. Heat on medium power for 2–3 minutes or until hot, stirring once to ensure even heating.

What to serve it with

Sweet Potatoes Gratin is a versatile side dish that pairs beautifully with a wide range of main courses. Here are some great options to complement the dish:

1. Roast Chicken: The creamy richness of the sweet potatoes contrasts nicely with the savory, crisp skin of roast chicken. A simple lemon-herb roast chicken works wonderfully.
2. Grilled Steak: The natural sweetness of the potatoes balances out the smoky flavors of a grilled steak. Try it with a perfectly seared ribeye or flank steak for a hearty, satisfying meal.
3. Pork Chops: Sweet potatoes and pork are a classic pairing. Try the gratin alongside pan-seared or roasted pork chops for a well-rounded dish.
4. Vegetarian Options: For a vegetarian meal, serve the Sweet Potatoes Au Gratin alongside a green salad or roasted vegetables like Brussels sprouts or carrots. A chickpea or lentil salad can also complement the richness of the gratin.
5. Holiday Dinners: Sweet Potatoes Au Gratin is an ideal side dish for Thanksgiving or Christmas dinner. Pair it with glazed ham, turkey, or a prime rib roast for an unforgettable holiday feast.

Whether you're preparing Sweet Potatoes Au Gratin for a family meal or a special occasion, this dish is guaranteed to impress. With a few tips and variations, you can easily make it your own, and leftovers can be enjoyed for days. It's the perfect combination of creamy, cheesy, and slightly sweet flavors that will have everyone coming back for seconds.

More tasty recipes with sweet potatoes:

• Sweet Potato Hummus
• Sweet Potato Hash Browns
• Easy Roasted Sweet Potatoes