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Patates Douces Gratinées – The Ultimate Sweet Potato Gratin Recipe for Beginners and Home Cooks in the USA

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A creamy, cheesy French-inspired sweet potato gratin that’s perfect for Thanksgiving, Christmas, or cozy family dinners. Easy to make and full of comforting fall flavors.

  • Author: touda
  • Prep Time: 20 minutes
  • Cook Time: 55 minutes
  • Total Time: 1 hour 15 minutes
  • Yield: 4–6 servings 1x
  • Category: Side Dish
  • Method: Baked
  • Cuisine: French-American
  • Diet: Vegetarian

Ingredients

Scale
  • 2 lbs (900 g) sweet potatoes, peeled and thinly sliced
  • 1 cup (250 ml) heavy cream
  • ½ cup (120 ml) milk
  • 1 garlic clove, minced
  • 2 tbsp butter, melted
  • 1 cup (100 g) grated Gruyère cheese (or cheddar for stronger flavor)
  • 1 tsp fresh thyme (or ½ tsp dried)
  • Salt and pepper to taste
  • ¼ tsp nutmeg (optional)
  • ½ cup grated Parmesan cheese (optional topping)
  • Chopped parsley for garnish

Instructions

  1. Preheat the oven to 375°F (190°C).
  2. Peel and slice sweet potatoes into thin, even rounds about ⅛ inch thick.
  3. In a saucepan, gently heat the cream, milk, garlic, thyme, salt, and pepper for 2–3 minutes until fragrant. Remove from heat.
  4. Grease a baking dish with butter. Arrange a layer of sweet potato slices, pour a bit of the cream mixture, and sprinkle grated cheese. Repeat layers until ingredients are used, ending with cheese on top.
  5. Cover with foil and bake for 35 minutes. Remove foil and bake an additional 20 minutes until golden and bubbly.
  6. Let rest 10 minutes before serving. Garnish with parsley or thyme and serve warm.

Notes

Slice sweet potatoes evenly for best texture. Use full-fat cream and Gruyère for the richest flavor. Let rest before serving to set layers beautifully.

Nutrition

Find it online: https://www.nytrecipe.com/patates-douces-gratinees/