French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping🥰

French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping is a warm, savory bowl that fills the kitchen with rich aroma and comfort.

Introduction — French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping

French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping is a cozy, hearty soup that blends caramelized onions and mushrooms with herbs and melty cheese on a croissant.
This version adds extra herbs and uses a flaky croissant for a tasty, gooey topping.
Read the full recipe on the detailed recipe page for step images and notes.

Why make French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping

Make this French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping when you want a simple, fancy-feeling meal.
It is great for cold nights, a weekend lunch, or when you need a warm, filling dish that feels special.

How to make French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping

To make French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping, follow simple steps and take time to caramelize the onions.
If you like meatier versions, try the short rib take on the dish for a richer soup like the short rib version for inspiration.

• Cook onions slowly in butter and oil until deep brown (about 35–45 minutes).
• Add sliced mushrooms and cook 5–7 minutes until they soften.
• Stir in garlic, thyme, bay leaf, and a splash of wine. Reduce slightly.
• Add beef or vegetable broth and simmer 20 minutes to blend flavors.
• Top bowls with torn croissant pieces and grated cheese, then broil until bubbly.

Ingredients : French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping

• 4 large yellow onions, thinly sliced
• 8 oz mushrooms, sliced (cremini or button)
• 3 tbsp butter + 1 tbsp olive oil
• 2 cloves garlic, minced
• 1 tsp dried thyme or 1 tbsp fresh thyme leaves
• 1 bay leaf
• 1/2 cup dry white wine or sherry (optional)
• 6 cups beef or vegetable broth
• Salt and black pepper to taste
• 2 large croissants, torn into pieces
• 1 1/2 cups grated Gruyère or Swiss cheese

Directions : French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping

• Heat butter and oil in a large pot over medium-low heat. Add onions and cook slowly, stirring often, until deep golden brown (35–45 minutes).
• Add mushrooms and cook 5–7 minutes until soft. Stir in garlic, thyme, and bay leaf for 1 minute.
• Pour in wine and scrape brown bits from the pot. Let wine reduce by half, about 2–3 minutes.
• Add broth, bring to a simmer, and cook 15–20 minutes. Season with salt and pepper. Remove bay leaf.
• Preheat broiler. Divide soup into oven-safe bowls. Top each bowl with croissant pieces and a generous layer of grated cheese.
• Broil 2–4 minutes until cheese is melted and golden. Watch closely to avoid burning.

How to serve French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping

Serve French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping hot and fresh from the broiler.
Pair with a simple salad or roasted vegetables for a full meal. Try this serving idea and enjoy the crunchy, cheesy croissant top like in the rich short rib French onion soup for a similar cozy presentation.

How to store French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping

Cool the soup before storing. Keep broth and croissant pieces separate for best texture.

• Fridge: Store soup in an airtight container up to 3–4 days.
• Freezer: Freeze broth (no croissant) up to 3 months. Thaw in fridge overnight and reheat gently.

Tips to make French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping

• Cook onions low and slow for best flavor and color.
• Use a mix of mushrooms for depth, or skip them for classic soup.
• Tear croissant into pieces so cheese melts into nooks and gives a soft, buttery top.
• Use an oven-safe bowl and watch the broiler—cheese browns fast.

Variation (if any) for French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping

• Vegetarian: Use vegetable broth and skip wine or use a splash of balsamic vinegar.
• Meatier: Add shredded short rib or roast beef to each bowl before broiling.
• Cheese swap: Try Emmental or fontina if you don’t have Gruyère.

FAQs about French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping

Q: Can I make this French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping ahead?
A: Yes. Make the soup base a day ahead and store in the fridge. Add croissant and cheese only when ready to broil.

Q: What cheese works best for French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping?
A: Gruyère is classic for melt and flavor. Swiss or Emmental work well too.

Q: Where can I buy good croissants for the topping?
A: You can find ready croissants online or local bakeries. Buy it here if you want quick shipped options.

Q: Can I skip the mushrooms in French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping?
A: Yes. The soup still tastes great without mushrooms and stays closer to a classic French onion soup.

Q: How do I avoid soggy croissant topping?
A: Toast croissant pieces lightly before topping to help them keep a bit of structure under the cheese.

French Onion Soup with Mushrooms, Extra Herbs & Cheesy Croissant Topping

A warm, savory soup that blends caramelized onions and mushrooms with herbs, topped with gooey, melty cheese and flaky croissant.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 1 hour hr 5 minutes mins

Total Time 1 hour hr 20 minutes mins

Course Appetizer, Soup

Cuisine French

Servings 4 servings

Calories 450 kcal

Ingredients

  

For the Soup Base

• 4 large yellow onions, thinly sliced
• 8 oz mushrooms, sliced (cremini or button)
• 3 tbsp butter
• 1 tbsp olive oil
• 2 cloves garlic, minced
• 1 tsp dried thyme or 1 tbsp fresh thyme leaves
• 1 leaf bay leaf
• 1/2 cup dry white wine or sherry (optional)
• 6 cups beef or vegetable broth Use vegetable broth for a vegetarian option.
• to taste salt and black pepper

For the Topping

• 2 large croissants, torn into pieces
• 1 1/2 cups grated Gruyère or Swiss cheese Can also use Emmental or fontina as alternatives.

Instructions

 

Preparation

• Heat butter and oil in a large pot over medium-low heat.
• Add onions and cook slowly, stirring often, until deep golden brown, about 35–45 minutes.

Cooking

• Add mushrooms and cook for 5–7 minutes until soft.
• Stir in garlic, thyme, and bay leaf for 1 minute.
• Pour in wine and scrape brown bits from the pot. Let wine reduce by half, about 2–3 minutes.
• Add broth, bring to a simmer, and cook for 15–20 minutes. Season with salt and pepper. Remove bay leaf.

Broiling

• Preheat broiler. Divide soup into oven-safe bowls.
• Top each bowl with croissant pieces and a generous layer of grated cheese.
• Broil for 2–4 minutes until cheese is melted and golden, watching closely to avoid burning.

Notes

Cool the soup before storing. Store broth and croissant pieces separately for best texture. Freeze broth (no croissant) for up to 3 months.

Keyword Cheesy Croissant, Comfort Food, Easy Recipe, French Onion Soup, Mushroom Soup