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A steaming crock of homemade French onion soup topped with a thick, toasted baguette slice and bubbly, golden-brown melted Gruyère cheese.

Cozy Homemade French Onion Soup

cozy, classic French onion soup featuring deeply caramelized onions, a rich beef broth, and a toasted baguette blanketed in bubbly, melted Gruyère cheese.
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Ingredients
  

  • 4 large yellow or sweet onions peeled and thinly sliced, about 3 lbs
  • 3 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 1/2 teaspoon granulated sugar
  • 2 cloves garlic minced
  • 1/4 cup dry white wine or extra beef broth to deglaze
  • 6 cups beef broth preferably low-sodium
  • 1 tablespoon Worcestershire sauce
  • 2 sprigs fresh thyme or 1/2 tsp dried thyme
  • 1 bay leaf
  • 1 small French baguette sliced into 1-inch thick rounds and toasted
  • 2 cups Gruyère or Swiss cheese freshly shredded
  • Salt and black pepper to taste

Instructions
 

  • Place a large Dutch oven over medium-low heat and melt the butter and olive oil together. Add the sliced onions, sugar, and a generous pinch of salt.
  • Cook the onions slowly for 30–35 minutes, stirring frequently. Be patient; cook until they turn deeply golden brown, caramelized, and sweet.
  • Stir in the minced garlic and cook for 1 minute until fragrant.
  • Pour in the white wine (or a splash of broth) to deglaze the pot. Use a wooden spoon to vigorously scrape up all the caramelized, browned bits stuck to the bottom of the pot.
  • Pour in the beef broth and Worcestershire sauce. Add the fresh thyme sprigs and the bay leaf.
  • Bring the soup to a gentle boil, then immediately reduce the heat to low. Simmer uncovered for 15 minutes to allow the flavors to marry.
  • Remove and discard the thyme sprigs and bay leaf. Taste the broth and season with salt and black pepper to taste.
  • Preheat your oven's broiler. Ladle the hot soup into 4 oven-safe bowls placed on a baking sheet.
  • Top each bowl of soup with 1–2 slices of the toasted baguette. Blanket the bread generously with the shredded Gruyère cheese.
  • Place under the broiler for 3–4 minutes, watching closely, until the cheese is bubbling, completely melted, and golden brown. Serve hot!

Notes

Do Not Rush the Onions: Cooking the onions over medium-low heat for the full 30-35 minutes is critical. High heat will burn them, resulting in a bitter soup.
Stale Bread is Best: Fresh bread will turn to mush in the liquid. Toast your baguette slices until they are very dry and crisp before floating them in the soup.
No Oven-Safe Bowls?: If your bowls cannot go under the broiler, simply place your baguette slices on a baking sheet, top with cheese, and broil them. Transfer the melted cheesy toasts to your bowls of hot soup just before serving.