Print

Costco French Onion Soup Recipe

Costco French Onion Soup
Print Recipe

Costco French Onion Soup is a rich and savory soup made with caramelized onions, a robust broth, and a layer of melted cheese served over toasted bread for an indulgent, comforting dish.

Ingredients

Scale
  • 4 large yellow onions, thinly sliced
  • 4 cups beef broth
  • 2 cups chicken broth
  • 1/4 cup dry sherry or white wine (optional)
  • 2 tablespoons unsalted butter
  • 2 tablespoons olive oil
  • 1 tablespoon all-purpose flour
  • 1 teaspoon sugar
  • 1 teaspoon Worcestershire sauce
  • 1 teaspoon dried thyme
  • Salt and freshly ground black pepper, to taste
  • 6 slices of baguette, toasted
  • 2 cups shredded Gruyère or Swiss cheese

Instructions

Step 1: Prepare the onions

  • Thinly slice the onions evenly.
  • Heat butter and olive oil in a large pot over medium heat.

Step 2: Caramelize the onions

  • Add sliced onions to the pot and sprinkle with sugar and a pinch of salt.
  • Cook for 25-30 minutes, stirring occasionally, until the onions are deeply golden and caramelized.

Step 3: Deglaze and thicken

  • Stir in the flour to coat the onions.
  • Pour in the sherry or wine, scraping up browned bits from the bottom of the pot.

Step 4: Simmer the broth

  • Add beef broth, chicken broth, Worcestershire sauce, and thyme.
  • Simmer the soup for 20 minutes, allowing the flavors to meld. Season with salt and pepper to taste.

Step 5: Assemble and broil

  • Preheat your broiler and ladle the soup into oven-safe bowls.
  • Top each bowl with a slice of toasted baguette and a generous amount of shredded cheese.
  • Broil for 2-3 minutes until the cheese is melted and bubbly.

Find it online: https://cookingwithadan.com/costco-french-onion-soup/