Description
This French Onion Mushroom Soup combines the deep, caramelized sweetness of onions with the rich, earthy flavors of mushrooms, all simmered in a savory broth and topped with crispy baguette slices and melty Gruyère cheese. It’s the ultimate comfort food, perfect for cozy nights or impressing dinner guests with its gourmet, restaurant-quality taste.
Ingredients
- Unsalted butter
- Olive oil
- Yellow onions, thinly sliced
- Cremini mushrooms, sliced
- Garlic cloves, minced
- Fresh thyme leaves
- Dry white wine
- All-purpose flour
- Beef broth
- Bay leaf
- Salt and black pepper
- Baguette slices
- Gruyère cheese, grated
Instructions
- Caramelize the onions in butter and olive oil over medium-low heat, stirring frequently until deeply golden.
- Add mushrooms and cook until tender, then stir in garlic and thyme.
- Deglaze the pot with white wine, scraping up any browned bits from the bottom.
- Sprinkle flour over the mixture and stir to coat, then slowly add beef broth and a bay leaf.
- Simmer for 20–30 minutes to let the flavors develop. Season with salt and pepper.
- Toast the baguette slices under the broiler until golden brown.
- Ladle soup into oven-safe bowls, top each with a toasted baguette slice and grated Gruyère.
- Broil until the cheese is bubbly and golden, then serve immediately.
Notes
- Low and slow is key – Properly caramelizing onions takes time but builds incredible flavor.
- Use quality broth – A rich, homemade beef broth enhances the depth of the soup.
- For extra creaminess, stir in a splash of heavy cream before serving.
- Make it vegetarian – Swap beef broth for vegetable broth and use a plant-based cheese.
- Store leftovers – The soup (without cheese and bread) keeps well in the fridge for 4 days and freezes for 3 months.
- Prep Time: 10 minutes
- Cook Time: 50 minutes
- Category: Soup
- Method: Stovetop & Broiling
- Cuisine: French