Description
A rich and creamy dish of Caramelized Onion Potatoes au Gratin, perfect for any occasion.
Ingredients
Scale
- 4 tablespoons Unsalted Butter
- 2 Sweet Yellow Onions, thinly sliced
- 1 teaspoon Sugar
- 4 lbs Russet Potatoes, peeled and sliced about 1/8” thick
- 2.5 cups Heavy Cream
- 1.5 cups Half & Half
- 3 Garlic Cloves, grated
- 2–3 Fresh Thyme sprigs
- 2 Bay Leaves
- a pinch Nutmeg
- 6 oz Gruyère Cheese, shredded
- Kosher Salt, to taste
- Freshly Ground Pepper, to taste
Instructions
- In a medium skillet, melt 2 tablespoons of butter over medium-low heat. Add the sliced onions and toss to coat them nicely. Cover the skillet for 5 minutes to allow the onions to wilt, then season with salt and pepper.
- Continue cooking the onions until they turn golden brown, then sprinkle with the sugar. Cook until they achieve a deep amber color, then set aside to cool.
- In a 4-quart pot or Dutch oven, add the heavy cream, half and half, grated garlic, thyme, bay leaves, and nutmeg. Season with salt and pepper, then add the sliced potatoes. Bring the mixture to a gentle simmer over low heat, cooking for about 15 minutes until they are just starting to get tender.
- Preheat your oven to 375°F (190°C). Use the remaining butter to generously coat a 3-quart baking dish. Discard the thyme sprigs and bay leaves from your potato mixture.
- Using a slotted spoon, place half of the potatoes into the prepared baking dish. Layer them with half of the caramelized onions and half of the shredded Gruyère cheese. Top with the remaining potatoes and pour the creamy sauce from the pot over all. Finally, sprinkle on the rest of the onions and cheese.
- Bake the gratin uncovered for 35-40 minutes, or until the cheese is bubbly and golden brown and the potatoes are tender. Allow it to rest for 15 minutes before serving.
Notes
- Prep Time: 20 minutes
- Cook Time: 50 minutes
- Category: Side Dish
- Method: Baking
- Cuisine: French
Nutrition
- Serving Size: 1 serving
- Calories: 450
- Sugar: 3 g
- Sodium: 600 mg
- Fat: 20 g
- Saturated Fat: 12 g
- Unsaturated Fat: 6 g
- Trans Fat: 0 g
- Carbohydrates: 60 g
- Fiber: 5 g
- Protein: 10 g
- Cholesterol: 60 mg