French Onion Lyonnaise Potatoes
French Onion Lyonnaise Potatoes are a decadent side dish that combines creamy Yukon Gold potatoes with sweet, caramelized onions, enveloped in a rich Gruyère cheese sauce. Perfect for cozy dinners and festive gatherings, this recipe is easy to prepare yet sure to impress your guests. The crispy top layer and buttery texture promise an unforgettable taste experience that will have everyone coming back for seconds!
- Prep Time: 15 minutes
- Cook Time: 60 minutes
- Total Time: 1 hour 15 minutes
- Yield: Serves 8
- Category: Side Dish
- Method: Baking
- Cuisine: French
Ingredients
Scale
- 2 lbs Yukon Gold potatoes, peeled and thinly sliced
- 2 medium sweet onions (Vidalia or Walla Walla), sliced
- 4 tbsp unsalted butter
- 1 cup heavy cream (or half-and-half)
- 1 cup grated Gruyère cheese
- 2 sprigs fresh thyme (or 1 tsp dried thyme)
- Salt and pepper, to taste
Instructions
- Preheat oven to 375°F (190°C).
- In a skillet over medium heat, melt butter. Add onions and sauté until translucent (about 10 minutes), stirring frequently.
- Stir in thyme, salt, and pepper; cook until onions are golden brown (approximately 20 minutes). Gradually add heavy cream while mixing.
- In a greased baking dish, layer half of the potato slices, then half the onion mixture, followed by half of the Gruyère cheese. Repeat layers.
- Cover with foil and bake for 40 minutes. Remove foil and bake until golden brown on top (15-20 minutes more).
Nutrition
- Serving Size: 1 cup (150g)
- Calories: 320
- Sugar: 2g
- Sodium: 500mg
- Fat: 18g
- Saturated Fat: 10g
- Unsaturated Fat: 6g
- Trans Fat: 0g
- Carbohydrates: 32g
- Fiber: 3g
- Protein: 7g
- Cholesterol: 45mg
Keywords: For a lighter version, substitute heavy cream with half-and-half. Add sautéed mushrooms or crispy bacon bits for extra flavor. Store leftovers in an airtight container for up to four days.