Caramelized Onion Scalloped Potatoes
A rich and elegant Caramelized Onion Scalloped Potatoes dish made with Yukon gold potatoes, caramelized onions, Gruyere, Parmesan, rosemary, and stock for a flavorful and comforting side.
8 Servings
Ingredients
Main Ingredients
- 2 tablespoons extra-virgin olive oil divided
- 4 cups thinly sliced onions
- 6 medium Yukon gold potatoes about 1 1/2 pounds, peeled and sliced 1/8 inch thick
- 3/4 cup grated Gruyere cheese divided
- 1/2 cup grated Parmesan cheese
- 1 teaspoon kosher salt
- 1/2 teaspoon white pepper or black pepper
- 1 teaspoon butter for greasing the baking dish
- 1/3 cup stock chicken, beef, or vegetable
- 1 teaspoon finely minced fresh rosemary
Instructions
Preheat the Oven
- Preheat the oven to 400°F (205°C).
Caramelize the Onions
- Heat 1 tablespoon of olive oil in a thick-bottomed sauté pan over medium-high heat. Add the sliced onions, stir to coat, and cook for 15–20 minutes, or until the onions are golden brown and caramelized.
Prepare the Potatoes
- Place the sliced potatoes in a large mixing bowl. Add the remaining 1 tablespoon of olive oil, 1/2 cup of the Gruyere cheese, all of the Parmesan cheese, salt, and white pepper. Toss gently to ensure the potatoes are evenly coated.
- For make-ahead preparation, ensure the potatoes are well-coated in oil to prevent discoloration.
Layer the Dish
- Lightly grease a 2–3 quart gratin dish or 9 x 13-inch baking dish with the butter. Spread the caramelized onions evenly along the bottom. Arrange the cheese-coated potatoes evenly on top of the onions.
Add Stock and Remaining Cheese
- Pour the stock evenly over the layered potatoes. Sprinkle the remaining 1/4 cup Gruyere over the top.
Cover and Bake
- Cover the dish tightly with aluminum foil. Bake for 50 minutes, or until the potatoes are tender when pierced with a fork.
Broil to Finish
- Remove the foil. Broil for 5 minutes, or until the top is lightly browned.
Garnish and Serve
- Remove from the oven and sprinkle with the minced fresh rosemary. Serve warm.
Notes
This recipe is naturally gluten-free. Ensure the following to maintain gluten-free integrity:
- Use a certified gluten-free stock, as some commercial stocks contain gluten additives.
- Verify that pre-grated cheeses do not contain anti-caking agents made from gluten.
Otherwise, the recipe requires no substitutions.