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Easy Gluten-Free French Onion Soup

Oven-safe crock of gluten-free French onion soup with bubbling golden Gruyere cheese and toasted gluten-free baguette on top

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A classic French onion soup made entirely gluten-free without sacrificing any of the deep, rich flavors. Sweet, slow-cooked onions simmered in savory certified gluten-free beef broth and topped with crusty gluten-free bread and melted Gruyere cheese.

Ingredients

Scale
  • 3 tablespoons unsalted butter
  • 2 tablespoons olive oil
  • 4 large sweet onions (like Vidalia), thinly sliced
  • 1 teaspoon salt
  • 1/2 teaspoon black pepper
  • 2 cloves garlic, minced
  • 1/4 cup dry white wine (like Sauvignon Blanc) or certified gluten-free beef broth
  • 6 cups certified gluten-free beef broth
  • 1 teaspoon fresh thyme leaves (or 1/2 teaspoon dried thyme)
  • 1 bay leaf
  • 4 slices gluten-free baguette or dense crusty gluten-free bread
  • 1 1/2 cups shredded Gruyere cheese (freshly shredded from a block recommended)

Instructions

  1. Melt butter and olive oil in a large Dutch oven over medium-low heat. Add sliced onions and 1 teaspoon salt. Stir to coat. Cook for 40 to 50 minutes, stirring every 8 to 10 minutes, until onions are deeply golden, soft, and jammy. Do not rush this step.
  2. Add minced garlic and stir constantly for 1 minute until fragrant and slightly nutty.
  3. Increase heat to medium-high. Add white wine or extra beef broth to deglaze, scraping up all browned bits from the bottom of the pot. Let bubble and reduce for 2 to 3 minutes.
  4. Add 6 cups certified gluten-free beef broth, fresh thyme, and bay leaf. Bring to a gentle simmer, reduce heat to low, and partially cover. Simmer for 20 minutes.
  5. Preheat oven broiler. Position rack about 6 inches from the heat element.
  6. Remove and discard bay leaf. Taste and adjust salt and pepper.
  7. Ladle hot soup into oven-safe crocks, filling three-quarters full. Top each with one slice of gluten-free bread.
  8. Pile shredded Gruyere generously over bread, letting it extend slightly over the edges of the crock.
  9. Place crocks on a baking sheet. Broil for 2 to 4 minutes, watching the entire time, until cheese is bubbling and golden brown.
  10. Remove carefully with oven mitts. Rest for 3 to 5 minutes before serving – crocks remain extremely hot.

Notes

  • Use a dense, sturdy gluten-free baguette or loaf that can hold up in hot broth without turning to mush immediately.
  • Always check your beef broth label for a certified gluten-free seal – some brands contain gluten-based thickeners or flavorings.
  • Freshly shredded Gruyere from a block melts smoother than pre-shredded bags, which contain anti-caking powder.
  • For a richer broth, add a small splash of cognac or brandy along with the wine during the deglazing step.
  • No oven-safe crocks? Toast the bread and cheese on a baking sheet under the broiler and float it on top of the soup in regular bowls.
  • Store soup base only (no bread or cheese) in the refrigerator. Always prepare the topping fresh when serving.

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