Savory Sweet Potato Gratins with Creme Fraiche Onions and Baco

Transform your side dish game with these luxurious Savory Sweet Potato Gratins with Crème Fraîche Onions and Bacon. Perfectly thin-sliced sweet potatoes are layered with caramelized onions, crispy bacon, and nutty Gruyere cheese, then bathed in a rich crème fraîche and heavy cream mixture infused with fresh thyme. Baked to golden, bubbly perfection, this comforting yet elegant gratin pairs beautifully with roasted meats or stands alone as a show-stopping centerpiece. Ideal for holiday gatherings or an indulgent weeknight treat, this recipe combines the natural sweetness of sweet potatoes with savory, smoky, and creamy notes for an unforgettable flavor experience.

Nutriscore Rating: 52/100

Prep Time:25 mins

Cook Time:55 mins

Total Time:80 mins

Servings: 6

Ingredients

• 3 large sweet potatoes
• 2 tablespoons unsalted butter
• 1 large yellow onion
• 6 slices bacon
• 1 cup creme fraiche
• 1 cup heavy cream
• 1 cup grated Gruyere cheese
• 1 teaspoon fresh thyme
• 1 teaspoon salt
• 0.5 teaspoon black pepper

Directions

Step 1

Preheat the oven to 375°F (190°C) and grease a 9x13-inch baking dish.

Step 2

Peel and thinly slice the sweet potatoes (about 1/8-inch thick) using a mandoline slicer or sharp knife. Set aside.

Step 3

In a large skillet, melt the butter over medium heat. Add the thinly sliced onion and cook, stirring occasionally, for 10–12 minutes until caramelized and golden.

Step 4

While the onions cook, place the bacon slices in another skillet and cook over medium heat until crispy, about 6–8 minutes. Remove the bacon, place on a paper towel-lined plate to drain, and crumble into small pieces once cooled.

Step 5

In a mixing bowl, whisk together the creme fraiche, heavy cream, fresh thyme, salt, and black pepper until well combined.

Step 6

Layer half of the sweet potato slices evenly in the greased baking dish, slightly overlapping them. Top with half of the caramelized onions, half of the bacon crumbles, and half of the Gruyere cheese.

Step 7

Pour half of the creme fraiche mixture over the layers, ensuring even coverage.

Step 8

Repeat the layering process with the remaining sweet potatoes, onions, bacon, and Gruyere cheese. Finish by pouring the rest of the creme fraiche mixture evenly over the top.

Step 9

Cover the dish loosely with aluminum foil and bake in the preheated oven for 35 minutes.

Step 10

Remove the foil and bake for an additional 20 minutes, or until the sweet potatoes are fork-tender and the top is golden and bubbly.

Step 11

Let the gratin rest for 5 minutes before serving. Garnish with additional thyme if desired and enjoy!

Nutrition Facts

Serving size	(1363.4g)

Amount per serving	% Daily Value*
Calories	3151.6

Total Fat 257.3g	0%
Saturated Fat 152.5g	0%
Polyunsaturated Fat 2.9g
Cholesterol 710.7mg	0%
Sodium 4457.3mg	0%
Total Carbohydrate 132.7g	0%
Dietary Fiber 19.1g	0%
Total Sugars 38.0g
Protein 64.6g	0%

Vitamin D 14.4IU	0%
Calcium 1548.5mg	0%
Iron 5.0mg	0%
Potassium 826.4mg	0%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 74.6%

Protein: 8.3%

Carbs: 17.1%