French Onion & Mushroom Soup

This rich French Onion & Mushroom Soup combines sweet caramelized onions with deeply savory sautéed mushrooms in a flavorful beef broth, finished with fresh thyme and topped with toasted bread and melted Gruyère cheese. It’s a hearty, comforting twist on the classic French onion soup that’s perfect for chilly days.

Why You’ll Love This Recipe

This French Onion & Mushroom Soup takes the beloved classic to the next level. The mushrooms add wonderful earthy depth and texture that beautifully complements the sweet, golden onions.

Every spoonful is packed with rich, savory flavor from the caramelized base and aromatic herbs. It’s incredibly satisfying, elegant enough for guests, yet cozy enough for family dinners.

The cheesy, bubbly topping makes it irresistibly comforting. Best of all, it tastes even better the next day as the flavors continue to develop.

Yield: 6 servings

French Onion & Mushroom Soup

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Rich French onion soup with earthy mushrooms, caramelized onions, and cheesy toasted bread topping.

Prep Time 20 minutes

Cook Time 1 hour 10 minutes

Additional Time 10 minutes

Total Time 1 hour 40 minutes

Ingredients

• 4 large yellow onions, thinly sliced
• 1 lb mixed mushrooms (cremini, shiitake), sliced
• 4 tbsp unsalted butter
• 2 tbsp olive oil
• 4 garlic cloves, minced
• 1 tbsp fresh thyme leaves
• ½ cup dry white or red wine
• 6 cups beef broth (or vegetable broth)
• 2 bay leaves
• Salt and freshly ground black pepper
• 6–8 slices baguette, toasted
• 2 cups shredded Gruyère cheese
• Fresh parsley (for garnish)

Instructions

1. Caramelize the onions: Melt butter and olive oil in a large Dutch oven over medium heat. Add sliced onions and cook slowly, stirring occasionally, for 25–30 minutes until deeply golden and caramelized.
2. Brown the mushrooms: Push onions to one side. Add mushrooms to the pot and cook until golden brown, about 8–10 minutes. Mix with the onions.
3. Add garlic and herbs: Stir in minced garlic and fresh thyme. Cook for 1–2 minutes until fragrant.
4. Deglaze: Pour in the wine and scrape up all the flavorful browned bits from the bottom. Let it reduce for 2–3 minutes.
5. Build the soup: Add beef broth and bay leaves. Season with salt and pepper. Bring to a boil, then reduce heat and simmer gently for 25–30 minutes.
6. Taste and adjust: Remove bay leaves. Taste the soup and adjust seasoning with more salt and pepper if needed.
7. Prepare the bread: While soup simmers, toast baguette slices until crisp and golden. You can rub them with a garlic clove for extra flavor.
8. Preheat broiler: Turn your oven broiler on high and position rack near the top.
9. Assemble servings: Ladle hot soup into oven-safe bowls. Top each with toasted bread slices and a generous handful of shredded Gruyère cheese.
10. Broil to finish: Place bowls on a baking sheet and broil for 2–4 minutes until the cheese is melted, bubbly, and golden brown. Watch carefully to avoid burning. Garnish with fresh parsley and serve immediately.

Notes

Use oven-safe bowls or ramekins for the classic cheesy topping. This soup is a complete meal when served with a simple green salad and extra crusty bread.

Nutrition Information

Yield

6

Serving Size

1
Amount Per Serving Calories 554Total Fat 40gSaturated Fat 22gUnsaturated Fat 19gCholesterol 111mgSodium 1536mgCarbohydrates 12gFiber 3gSugar 5gProtein 31g

The recipes and nutritional information on Yum Tonight are for informational purposes only. Always consult a healthcare provider for personalized dietary advice.

Recipe Tips and Tricks

• Caramelize onions slowly and patiently for the sweetest, deepest flavor.
• Brown mushrooms well before adding to the soup for maximum umami.
• Use a mix of mushrooms for interesting texture.
• Quality beef broth makes a big difference — use homemade if possible.
• Dry the bread well before toasting so it doesn’t get soggy.
• Broil the cheese until golden and bubbling for the classic finish.
• Make a big batch — it reheats beautifully.

Ingredients Notes

• Onions: Yellow or sweet onions caramelize beautifully and form the sweet backbone of the soup.
• Mushrooms: Cremini, button, or a mix with shiitake add earthy flavor and meaty texture.
• Broth: Beef broth gives the classic rich taste; use vegetable broth for vegetarian version.
• Cheese: Gruyère or Swiss cheese melts wonderfully and creates the signature cheesy crust.
• Bread: Baguette slices provide the perfect crunchy base for the cheese.
• Herbs: Fresh thyme enhances the French character.
• Wine: A splash of dry white or red wine adds complexity and brightness.

Variations and Substitutions

Make it vegetarian using vegetable broth and skipping cheese or using plant-based alternatives. Add a splash of brandy or sherry for extra depth. Include garlic for more aromatic flavor.

Use chicken broth for a lighter taste. Add fresh spinach or kale at the end for color and nutrients. Turn it into a heartier meal by adding cooked barley or farro.

For a creamier version, stir in a touch of heavy cream just before serving. Wild mushrooms create a gourmet upgrade when in season.

Storage Options

Refrigerate in an airtight container for up to 4 days. The soup (without bread and cheese) freezes excellently for up to 3 months. Thaw overnight in the refrigerator and reheat gently on the stovetop. Add fresh toasted bread and cheese when serving.

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Until you can read, French Mushroom and Wine Sauce over Steak