Description
This French Onion Chicken & Rice Casserole is a comforting and flavorful one-dish meal featuring deeply caramelized sweet onions, tender chicken, and fluffy rice all baked together and topped with melted Gruyère cheese. The dish combines the rich flavors of classic French onion soup with hearty ingredients, making it perfect for a cozy family dinner.
Ingredients
Scale
For the Onion Base
- 4 tbsp unsalted butter
- 2 tbsp olive oil
- 2 large sweet onions, thinly sliced
- 1 tsp salt, divided
- 1/2 tsp black pepper, divided
- 1 tbsp all-purpose flour
- 1/2 cup dry white wine
For the Casserole
- 1 cup uncooked long-grain white rice
- 2 cups chicken stock
- 2 cups cooked chicken, shredded or diced
- 1 cup fresh baby spinach
- 1 cup sliced mushrooms
- 1/2 tsp dried thyme
- 1/4 tsp garlic powder
- 1 cup shredded Gruyère cheese
Instructions
- Preheat Oven: Preheat the oven to 350°F (175°C) to prepare for baking the casserole.
- Caramelize Onions: In a large skillet over medium heat, melt the butter with olive oil. Add the sliced onions and cook for 25-30 minutes, stirring occasionally, until they are deeply caramelized and tender. Season with half the salt (1/2 tsp) and half the black pepper (1/4 tsp) during cooking.
- Thicken Onion Mixture: Sprinkle the flour over the caramelized onions and stir well. Cook for 1 minute to remove the raw flour taste. Pour in the dry white wine and scrape up any browned bits from the skillet. Allow the wine to reduce for 2-3 minutes, thickening the mixture.
- Assemble Casserole: In a 9×13-inch baking dish, combine the uncooked rice, chicken stock, cooked chicken, fresh baby spinach, sliced mushrooms, dried thyme, garlic powder, and the remaining salt and black pepper. Stir everything together evenly.
- Layer Onions: Spread the caramelized onion mixture evenly over the rice and chicken mixture in the baking dish. Cover the dish tightly with aluminum foil to retain moisture during baking.
- Bake Covered: Place the casserole in the preheated oven and bake for 35 minutes, allowing the rice to cook through and flavors to meld.
- Add Cheese and Finish Baking: Remove the foil and sprinkle the shredded Gruyère cheese on top of the casserole. Return to the oven and bake uncovered for an additional 10-15 minutes until the cheese is melted, bubbly, and golden brown.
- Rest and Serve: Remove the casserole from the oven and let it rest for 5 minutes before serving to allow it to set slightly for easier portioning.
Notes
- Use cooked chicken leftover from previous meals or rotisserie chicken for convenience.
- If you prefer a non-alcoholic dish, substitute the white wine with additional chicken stock or white grape juice.
- Caramelizing onions takes time but is crucial for the rich depth of flavor in this recipe.
- Gruyère cheese provides a nutty, creamy finish; substitute with Swiss or mozzarella if unavailable.
- Ensure the casserole dish is well covered during the initial baking to allow rice to cook evenly and retain moisture.
