Description
Indulge in the rich flavors of this French-inspired French Onion Mushroom Casserole. Caramelized onions, savory mushrooms, and a blend of cheeses come together to create a comforting and satisfying dish that is perfect as a side or main course.
Ingredients
Scale
For the Caramelized Onions:
- 2 tbsp butter
- 2 tbsp olive oil
- 2 large yellow onions (thinly sliced)
- 1/2 tsp salt
- 1/4 tsp black pepper
- 1 tsp fresh thyme or 1/2 tsp dried
- 3 cloves garlic (minced)
For the Mushroom Mixture:
- 16 oz mushrooms (sliced – cremini, button, or mix)
- 1/4 cup dry white wine or vegetable broth
- 1/2 cup sour cream
- 1/2 cup shredded Gruyère cheese
- 1/2 cup shredded mozzarella cheese
- 1/2 cup crispy fried onions (plus more for topping)
- 1/4 cup grated Parmesan cheese
- Nonstick spray for baking dish
Instructions
- Preheat the Oven: Preheat the oven to 375°F and lightly grease a 9×9-inch baking dish with nonstick spray.
- Caramelize the Onions: In a skillet, cook onions with salt, pepper, and thyme until caramelized. Add garlic.
- Cook the Mushroom Mixture: Add mushrooms to the skillet, cook, then deglaze with wine or broth.
- Combine Ingredients: Stir in sour cream, cheeses, and crispy fried onions.
- Bake: Transfer mixture to baking dish, top with crispy fried onions, and bake until golden.
- Serve: Serve warm as a side or main dish.
Notes
- This casserole pairs well with roasted meats or can be served over rice or mashed potatoes.
- You can prepare the caramelized onions in advance to save time.
- Prep Time: 15 minutes
- Cook Time: 45 minutes
- Category: Side Dish
- Method: Baking
- Cuisine: French-Inspired
Nutrition
- Serving Size: 1 cup
- Calories: 280
- Sugar: 6g
- Sodium: 390mg
- Fat: 20g
- Saturated Fat: 10g
- Unsaturated Fat: 9g
- Trans Fat: 0g
- Carbohydrates: 16g
- Fiber: 2g
- Protein: 8g
- Cholesterol: 35mg
