Gluten-Free French Onion Soup Recipe

As tested and written, this recipe is refined sugar-free. If this is not a concern for you, add 1 tsp. Worcestershire sauce before simmering for added depth.

This recipe uses slices of Gruyére cheese for visual effect. To create the stringy, chewy goodness found in classic restaurant-style French Onion Soup, use equal amounts (3 oz. each) of coarsely grated Gruyére cheese and Mozzarella instead of the Gruyére and Parmesan used below.

Tip: To prevent cracking, don’t place ramekins or bowls too close to the broiler if you don’t know their temperature rating. Keep a close watch while broiling to prevent over-browning.

This rich and delicious recipe takes some time to come together. However, the results are well worth it. The richly caramelized onions and slowly simmered broth are incredible.

French Onion Soup

Gluten-Free French Onion Soup

Prep Time 20 mins
Cook Time 3 hrs
Total Time 3 hrs 20 mins
Course Soup
Servings 4


  • 1/4 cup Unsalted butter
  • 2 lbs Yellow onions, trimmed and sliced root to tip
  • Sea salt and black pepper, to taste
  • 1/2 cup Dry red wine
  • 2 tbsp Balsamic vinegar
  • 4 cup Beef broth, preferably organic
  • 2 Whole bay leaves
  • 2 tsp Italian seasoning
  • 1 tsp Garlic powder
  • 4-5 Sprigs, fresh thyme
  • 6 oz Gruyère cheese, sliced thin
  • 1/2 cup Parmesan cheese, freshly grated


  • Heat butter in a large, high-sided skillet over medium heat. Add sliced onions and season with salt and black pepper, to taste. Stir to combine. Cook, stirring occasionally, until caramelized, approximately45 minutes to one hour.
  • Deglaze the bottom of the pan by adding the red wine and balsamic vinegar and gently scraping the browned bits off the bottom with a spatula.
  • Add the broth, bay leaves, Italian seasoning, garlic powder, and sprigs of fresh thyme. Season with additional salt and black pepper, if desired, and stir to combine.
  • Increase heat to high and bring to a rapid boil, then immediately reduce heat to medium-low. Loosely cover the skillet with a lid and simmer, stirring occasionally, for two hours.
  • Remove from heat and discard the thyme stems and bay leaves. Divide the soup between four large oven-safe ramekins or bowl. Top with slices of the Gruyère cheese, followed by the freshly grated Parmesan cheese.
  • Place top oven rack in the second position from the top and set the broiler to high.
  • Arrange ramekins on a large, rimmed baking sheet and place it on the top oven rack. Broil until the cheese is melted and golden brown, approximately 8-10 minutes. Remove from oven and serve immediately garnished with a few fresh thyme leaves. Enjoy!
Keyword French Onion Soup

Gluten-Free French Onion Soup Recipe

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