Description
French Onion Soup Stuffed Mushrooms bring the rich, caramelized flavors of classic French onion soup into bite-sized stuffed mushroom caps. Filled with sweet caramelized onions, garlic, broth, thyme, and topped with melted Gruyère cheese, this appetizer is perfect for gatherings or cozy nights, offering comforting, savory taste in a simple and customizable dish.
Ingredients
Scale
Mushrooms
- 12 medium to large button mushrooms, cleaned and stems removed
Filling
- 3 large yellow onions, thinly sliced
- 3 garlic cloves, minced
- 3 tablespoons butter
- 1/2 cup beef or vegetable broth
- 1 teaspoon fresh or dried thyme
- Salt and pepper, to taste
- Stems from mushroom caps, finely chopped
Topping
- 1 cup Gruyère cheese, sliced or shredded
Instructions
- Prepare the Mushrooms: Carefully clean and dry the mushrooms, then gently remove the stems and set them aside. Ensure the mushroom caps remain intact as they will hold the filling.
- Caramelize the Onions: Heat butter in a large skillet over medium-low heat. Add thinly sliced yellow onions and a pinch of salt, cooking slowly for about 25-30 minutes until the onions develop a deep golden brown caramel color. Stir occasionally and be patient for full flavor development.
- Add Garlic and Broth: Once onions are caramelized, add minced garlic and cook for one more minute. Pour in the broth and sprinkle thyme, then simmer until the mixture reduces slightly and thickens, concentrating the flavors.
- Fill the Mushrooms: Chop the reserved mushroom stems finely and fold them into the onion mixture. Spoon the savory filling generously into each mushroom cap.
- Top with Cheese and Bake: Arrange the stuffed mushrooms on a baking sheet. Cover each with a slice or sprinkle of Gruyère cheese. Bake at 375°F (190°C) for 15-20 minutes, until the cheese melts and bubbles with a golden finish.
Notes
- Low and slow onion caramelization is essential for deep, sweet flavor.
- Dry mushrooms well to prevent soggy stuffing.
- Use a wide pan to avoid overcrowding when caramelizing onions for even cooking.
- Fresh thyme brightens the dish and enhances authentic flavors.
- Let mushrooms rest for a few minutes after baking to allow the filling to set.
- Prep Time: 20 minutes
- Cook Time: 40 minutes
- Category: Appetizers
- Method: Baking
- Cuisine: French
Nutrition
- Serving Size: 2 stuffed mushrooms
- Calories: 150
- Sugar: 6g
- Sodium: 250mg
- Fat: 9g
- Saturated Fat: 5g
- Unsaturated Fat: 3g
- Trans Fat: 0g
- Carbohydrates: 12g
- Fiber: 2g
- Protein: 6g
- Cholesterol: 20mg