Creamy French Onion and Mushroom Soup
Indulge in the rich, comforting embrace of this Creamy French Onion and Mushroom Soup, a delightful twist on a classic. Sweet, deeply caramelized onions and earthy mushrooms are simmered in a savory broth, brightened with white wine and fresh herbs, then finished with a touch of luxurious cream. Topped with toasted French bread and bubbly, melted Gruyère, this soup transforms a simple meal into an extraordinary culinary experience, perfect for a cozy evening.
Prep Time
25 minutes
Cook Time
70-75 minutes
Total Time
1 hour 40 minutes
Servings
4-6 generous servings
Keywords
Why This Recipe Delivers
- A delightful twist on classic French onion soup with added earthy mushrooms.
- Luxuriously creamy texture enhances the rich, savory broth.
- Features deeply caramelized onions for unparalleled depth of flavor.
- Topped with toasted bread and perfectly melted Gruyère for that iconic finish.
- Impressive enough for guests, yet comforting for a weeknight meal.
Ingredients
- 90 grams (6 tablespoons) salted butter
- 4 medium yellow onions, thinly sliced (approximately 1 kg or 2.2 pounds)
- 300 milliliters (1 1/4 cups) dry white wine, such as Pinot Grigio or Sauvignon Blanc
- 3 cloves garlic, minced or grated
- 200 grams (2 cups) cremini or wild mushrooms, sliced
- 20 grams (2 tablespoons) fresh thyme leaves, roughly chopped
- 10 grams (2 tablespoons) fresh sage, finely chopped
- 5 milliliters (1 teaspoon) honey
- 1.5-2 liters (6-8 cups) low sodium chicken or vegetable broth
- 10 milliliters (2 teaspoons) Worcestershire sauce (or soy sauce for vegetarian option)
- 2 bay leaves
- Kosher salt and freshly ground black pepper, to taste
- 120 milliliters (1/2 cup) heavy cream (35% fat)
- 6 slices French baguette or artisanal bread
- 200 grams (2 cups) shredded Gruyère cheese
Instructions
- Melt together 90 grams (6 tablespoons) of salted butter, the thinly sliced yellow onions, and 5 milliliters (1 teaspoon) of honey in a large Dutch oven or heavy-bottomed pot over medium-high heat. Cook, stirring occasionally, until the onions have softened significantly, which will take about 10 minutes.
- At this stage, begin the caramelization process by slowly adding 180 milliliters (3/4 cup) of the dry white wine, approximately 60 milliliters (1/4 cup) at a time. Allow each addition of wine to cook into and evaporate from the onions before adding the next, scraping up any browned bits from the bottom of the pot. Continue this process for another 10-15 minutes, ensuring the onions achieve a deep, rich, golden-brown caramelization. This slow process is key to developing profound flavor.
- Add the minced or grated garlic, sliced mushrooms, fresh thyme leaves, and chopped fresh sage to the caramelized onions. Season generously with kosher salt and freshly ground black pepper. Cook for another 3-4 minutes, stirring frequently, allowing the mushrooms to soften and release their moisture, and the aromatics to become fragrant.
- Pour in the remaining 120 milliliters (1/2 cup) of dry white wine, the 1.5-2 liters (6-8 cups) of low sodium chicken or vegetable broth, 10 milliliters (2 teaspoons) of Worcestershire sauce (or soy sauce), and the 2 bay leaves. Add another pinch each of salt and pepper. Increase the heat to medium-high and bring the soup to a gentle simmer. Let it simmer uncovered for 10 minutes to allow the flavors to meld beautifully.
- Stir in the 120 milliliters (1/2 cup) of heavy cream and continue to cook for another 5-10 minutes over medium-low heat, just below a simmer, allowing the soup to thicken slightly and the cream to incorporate fully. Carefully remove the bay leaves from the soup and discard them. Taste the soup and adjust the seasoning with additional salt and pepper as needed.
- While the soup is simmering, preheat your oven to 200 degrees Celsius (400 degrees Fahrenheit). Arrange the 6 slices of French bread on a baking sheet in a single layer. Toast the bread in the preheated oven for 10-15 minutes, or until the slices are very dry and lightly golden. This helps prevent them from becoming soggy in the soup.
- Once the bread is toasted, switch the oven setting to broil. Carefully ladle the hot soup into individual oven-safe bowls. Place one toasted slice of bread on top of the soup in each bowl, ensuring it floats slightly.
- Evenly distribute the 200 grams (2 cups) of shredded Gruyère cheese over the bread in each bowl. For easier handling, place each soup bowl on a separate baking sheet or a larger oven-safe tray before transferring them to the oven. Broil for 3 to 5 minutes, keeping a close eye on them, until the cheese is bubbly, deeply melted, and golden brown.
- Carefully remove the bowls from the oven. Garnish each serving with a sprinkle of fresh thyme leaves before serving immediately. Enjoy this comforting, rich, and utterly satisfying Creamy French Onion and Mushroom Soup.
Tools You’ll Need
- Large Dutch oven or heavy-bottomed pot (5-6 liter capacity)
- Sharp knife
- Cutting board
- Measuring cups and spoons
- Whisk or spoon for stirring
- Baking sheet
- Oven-safe soup bowls (ramekins or crocks)
- Ladle
Essential Success Tips
- Take your time caramelizing the onions; this step is crucial for the soup's depth of flavor. Don't rush it.
- Use a good quality dry white wine that you would enjoy drinking, as its flavor concentrates in the soup.
- Make sure your French bread is very dry and toasted before adding it to the soup to prevent it from getting soggy too quickly under the cheese.
- Keep a close watch on the soup bowls under the broiler; cheese can go from perfectly golden to burnt in seconds.
- Adjust seasoning at the end; taste the soup after adding the cream and before serving to ensure perfect balance.
Professional Cooking Secrets
- To achieve truly exceptional onion caramelization, consider deglazing with a splash of water or broth between wine additions to capture all those flavorful fond bits at the bottom of the pot.
- For an even richer mushroom flavor, consider sautéing a small portion of mushrooms separately until deeply browned, then adding them to the soup for texture contrast and intensified umami.
- A tiny pinch of baking soda added during the initial onion caramelization can sometimes speed up the browning process slightly, though traditional slow caramelization is always preferred for the best flavor.
Notes
- Storage: Leftover soup can be stored in an airtight container in the refrigerator for up to 3-4 days. It's best to store the croutons and cheese separately and assemble just before serving when reheating.
- Vegetarian Option: Easily make this soup vegetarian by substituting chicken broth with high-quality vegetable broth and using soy sauce instead of Worcestershire sauce (check labels, as some Worcestershire sauces contain anchovies).
- Make Ahead: The soup base (before adding cream or topping) can be made a day in advance and reheated gently before finishing with cream and broiling.
Frequently Asked Questions
Can I make this soup ahead of time?
Yes, you can prepare the soup base (up to the point before adding cream) a day or two in advance. Store it in the refrigerator and gently reheat before stirring in the cream and proceeding with the bread and cheese topping.
What kind of mushrooms are best for this soup?
Cremini mushrooms are a fantastic choice for their earthy flavor and firm texture. Wild mushrooms like shiitake or oyster can also be used to add more complex, gourmet notes to the dish.
My cheese isn't melting properly under the broiler, what should I do?
Ensure your oven's broiler is fully preheated and that the soup bowls are placed on a rack that is not too far from the heat source. If the cheese isn't browning, it might be too far away. Also, ensure the cheese is at room temperature to help it melt more evenly.
Nutrition Facts (Per Serving)
Calories: 510, Protein: 22g, Fat: 40g, Carbs: 28g per serving (estimated, based on 6 servings).
Allergy Information
Contains dairy (butter, cream, cheese) and gluten (French bread). For a gluten-free option, use certified gluten-free bread or omit the bread and cheese entirely. Vegetarian option available by substituting chicken broth and Worcestershire sauce.
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