Decadent Mushroom & Caramelized Onion Soup Recipe

If you’re looking for a bowl of pure comfort that’s both earthy and elegant, Mushroom & Caramelized Onion Soup is your answer. This luxurious soup combines the deep, savory flavors of caramelized onions and mushrooms with a creamy, velvety texture. It’s perfect for chilly evenings, an indulgent appetizer, or a soul-warming main course.

With just a few simple ingredients and a bit of patience to let the onions caramelize to perfection, you can create a restaurant-quality soup at home. Let’s dive into this rich and flavorful recipe.


Ingredients

Here’s what you’ll need to make 4–6 servings of Mushroom & Caramelized Onion Soup:

For the caramelized onions:

  • 3 large yellow onions, thinly sliced
  • 2 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • ½ teaspoon salt
  • 1 teaspoon sugar (optional, for faster caramelization)

For the soup:

  • 3 tablespoons unsalted butter
  • 1 pound mushrooms (cremini, button, or a mix), thinly sliced
  • 3 cloves garlic, minced
  • 1 teaspoon fresh thyme (or ½ teaspoon dried thyme)
  • ¼ cup dry white wine (optional, for added depth)
  • 4 cups vegetable or chicken broth
  • 1 cup heavy cream (or milk for a lighter version)
  • 2 tablespoons all-purpose flour (or cornstarch for gluten-free)
  • Salt and black pepper, to taste

For garnish:

  • Fresh parsley, chopped
  • Croutons or toasted bread
  • Shaved Parmesan or Gruyère cheese

INSTRUCTIONS:

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