French onion soup is a rustic French classic built on deeply caramelized onions simmered in beef and white wine broth, finished with a crust of melted Gruyère and provolone cheese on toasted baguette. The magic is in the slow caramelization, which transforms simple onions into sweet, complex depth.
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Thinly slice the yellow onions.
In a large Dutch oven or heavy-bottomed pot, melt butter over medium heat.
Add the sliced onions to the pot, season with salt and pepper, and stir to coat.
Cook the onions, stirring occasionally, until they soften. Add the fresh thyme leaves.
Continue to cook the onions low and slow, stirring periodically, for 45-60 minutes until they are deeply caramelized, jammy, and dark brown.
Add the minced garlic and cook for one more minute until fragrant.
Deglaze the pot by pouring in the white wine and scraping all the browned bits (fond) from the bottom of the pot.
Pour in the beef broth and add the Worcestershire sauce. Stir to combine.
Bring the soup to a simmer and let it cook for at least 15 minutes to allow the flavors to meld.
While the soup simmers, prepare the croutons. Slice the baguette, brush with melted butter, and season with garlic powder and pepper. Toast in the oven until golden and crisp.
Preheat your broiler. Ladle the soup into oven-safe bowls.
Top the soup with a layer of shredded Gruyère cheese, then place two croutons on top. Add a slice of provolone and finish with another generous layer of Gruyère.
Place the bowls on a baking sheet and broil for 2-3 minutes, watching carefully, until the cheese is melted, bubbly, and golden brown.
Carefully remove from the oven, let cool for a few minutes, and serve hot.
Store cooled soup in an airtight container in the refrigerator for up to 3 days. Reheat on the stove over medium heat. Assemble with croutons and cheese just before serving.
Large heavy-bottomed pot or Dutch oven · Broiler-safe soup bowls or oven-safe crocks
Plan 30-40 minutes of slow cooking over medium to medium-low heat, stirring frequently. The onions should turn deep golden brown without burning.
Yes. Make the soup up to 2 days ahead, store in the refrigerator, then reheat gently on the stove. Add the toasted croutons and cheese just before serving to keep them crispy.
Swiss, Emmental, or aged cheddar work well. Avoid pre-shredded cheese as it doesn't melt as smoothly.
You can, but it will darken the broth and add deeper, earthier notes. Red wine will change the flavor profile noticeably—white wine keeps the soup lighter and more traditional.
Toast the baguette slices separately in the oven first, then assemble the bowls and broil only until the cheese bubbles and turns golden, about 2-3 minutes.
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