Start by peeling and slicing all onions into thin even slices. Uniform slices help them cook evenly. Take your time here because this step builds the foundation of flavor for the entire Bobby Flay French Onion Soup Recipe.

Heat butter and olive oil in a large pot over medium heat. Add onions and stir often. Cook slowly for 30–40 minutes until golden brown and soft. This step is key for deep sweetness.

Once onions are caramelized, add minced garlic. Cook for one minute only. Then add thyme and bay leaf. Stir gently so flavors mix well. This adds aroma and depth to your soup base.

Add white wine slowly into the pot. Scrape the bottom to release brown bits. Let it simmer for 5–7 minutes. The alcohol will cook off, leaving a rich and slightly tangy flavor base.

Pour in beef broth and mix everything well. Add salt and black pepper. Let the soup simmer for 25 minutes on low heat. This allows all flavors to blend beautifully into a rich soup.

While soup simmers, toast baguette slices until golden. Then shred Gruyère cheese. The bread should be crisp enough to hold soup without becoming soggy too quickly.

Pour hot soup into oven-safe bowls. Place toasted bread on top. Cover generously with cheese. Broil for 3–5 minutes until cheese melts and turns golden. Serve immediately while hot and bubbly.