This luxurious Creamy French Onion and Mushroom Soup blends the deep, savory flavors of caramelized onions and sautéed mushrooms with a rich, creamy broth. Finished with a hint of thyme and optional melted cheese, it’s like French onion soup meets a creamy mushroom bisque—elegant, comforting, and unforgettable.
Ingredients
- 2 tablespoons butter
- 1 tablespoon olive oil
- 2 large yellow onions, thinly sliced
- 2 cloves garlic, minced
- 1 teaspoon sugar (optional, for faster caramelization)
- 1/2 teaspoon salt
- 1/2 teaspoon dried thyme (or 1 tsp fresh)
- 1/4 teaspoon black pepper
- 8 oz (225g) cremini or button mushrooms, sliced
- 1 tablespoon all-purpose flour (for thickening)
- 1/4 cup dry white wine (optional)
- 4 cups beef broth (or vegetable broth for vegetarian)
- 1 cup heavy cream or half-and-half
- 1/2 cup grated Gruyère or Swiss cheese (optional, for topping)
- Fresh thyme or parsley, for garnish
Instructions
- Caramelize onions:
In a large pot, heat butter and olive oil over medium-low heat. Add onions, sugar, and salt. Cook for 20–25 minutes, stirring often, until deep golden brown. - Add garlic and thyme:
Stir in garlic, thyme, and black pepper. Cook for 1 minute until fragrant. - Add mushrooms:
Increase heat to medium. Add mushrooms and cook for 5–7 minutes until softened and browned. - Thicken and deglaze:
Sprinkle flour over the mixture and stir for 1 minute. Add wine to deglaze the pot, scraping up browned bits. - Simmer the soup:
Pour in broth. Bring to a simmer and cook for 10–15 minutes to meld flavors. - Add cream:
Reduce heat to low and stir in heavy cream. Simmer gently for 5 minutes—do not boil. - Serve:
Ladle into bowls. Optionally, top with shredded Gruyère and broil until bubbly. Garnish with fresh thyme or parsley.
Tips
- Caramelize onions low and slow for the richest flavor. Don’t rush this step!
- Use a mix of mushrooms (e.g., cremini, shiitake, portobello) for deeper flavor.
- Deglaze with wine or broth to lift up all the caramelized goodness from the pan.
- Use cream or half-and-half depending on how rich you want it.
Variations and Substitutions
- Make it vegetarian: Use vegetable broth and skip the cheese or use plant-based alternatives.
- Add grains: Stir in cooked wild rice or barley for extra heartiness.
- Go cheesy: Top with cheesy croutons or toast slices topped with melted Swiss or Gruyère.
- Herb it up: Add rosemary, sage, or bay leaf during simmering for an herbal twist.
- Thicken more: Stir in a small amount of cornstarch slurry if you want a thicker consistency.
FAQs
Can I make this ahead of time?
Yes! It tastes even better the next day. Store in the fridge for up to 4 days. Reheat gently on the stove.
Can I freeze this soup?
Yes, but cream-based soups can sometimes separate. Stir well when reheating, and avoid freezing the version with cheese topping.
Can I skip the flour?
Yes, the soup will be thinner but still delicious. You can thicken with cream or a blended portion of soup instead.
Is wine necessary?
Nope. Just use extra broth for deglazing if you prefer no alcohol.
Serving Suggestions
- Serve with toasted sourdough, cheesy garlic bread, or herb focaccia.
- Add a green salad with Dijon vinaigrette for a French bistro-style meal.
- Top with croutons and broiled cheese for a French onion soup twist.
- Pair with a glass of Chardonnay, light Pinot Noir, or sparkling water with lemon.
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