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Gluten-Free French Onion Soup with Croutons

By the Gluten Free Recipes team ·

A deeply savory and comforting gluten-free French Onion Soup, featuring caramelized onions and a rich broth, topped with delightfully crisp gluten-free croutons. This hearty soup offers a perfect balance of sweet, savory, and umami flavors, making it an ideal meal for any occasion.

Easy Gluten-Free Verified gluten free
Prep: 10 min Cook: 30 min Total: 40 min Serves: 4

At a glance: This easy soups and stews recipe yields 4 servings in about 40 minutes (10 min prep, 30 min cook). It uses 11 ingredients — including certified gluten-free chicken or vegetable stock, yellow onions, butter or olive oil — and walks through 6 steps. Updated . Browse more soups and stews recipes or return to all gluten-free recipes.

Gluten-Free French Onion Soup with Croutons — soups and stews recipe, serves 4

Cross-Contamination Warning for Gluten-Free French Onion Soup with Croutons: When preparing this soups and stews recipe, commercial broths and stocks are high risk — many contain yeast extract (often barley-derived), wheat starch, or caramel colour from wheat. Use certified GF stock (Pacific Foods Organic GF, Swanson Natural Goodness) or make your own. In a shared kitchen, avoid porous materials — wooden spoons, wooden cutting boards, and scratched non-stick pans can harbor gluten proteins even after washing. Prefer glass, metal, or silicone tools. Stock often contains yeast extract or barley derivatives; use only certified gluten-free stock.

Gluten-Free Notes for Gluten-Free French Onion Soup with Croutons: This recipe relies on certified gluten-free stock and a gluten-free flour blend for thickening, ensuring it's safe for those avoiding gluten-containing grains. The croutons are made from certified gluten-free bread.

Scale Recipe:
4 servings
Ingredient amounts update automatically

Ingredients

  • 6 cups certified gluten-free chicken or vegetable stock
  • 1 lb yellow onions, thinly sliced
  • 2 tbsp butter or olive oil
  • 2 cloves garlic, minced
  • 1 tsp dried thyme
  • 1/2 cup dry white wine (optional, ensure GF)
  • 1 tbsp gluten-free all-purpose flour blend
  • Salt and freshly ground black pepper to taste
  • 4 slices gluten-free baguette or bread, cut into 1-inch cubes
  • 1 tbsp olive oil
  • 1/4 cup grated Gruyere or Swiss cheese (optional, for topping)

Instructions

  1. 1

    In a large, heavy-bottomed pot or Dutch oven, melt the butter or heat the olive oil over medium-low heat. Add the thinly sliced yellow onions and cook, stirring occasionally, until they are deeply caramelized and a rich golden-brown color, about 25-30 minutes. This slow caramelization is key to the soup's sweet, complex flavor.

  2. 2

    Add the minced garlic and dried thyme to the pot with the caramelized onions. Cook for an additional 1-2 minutes until the garlic is fragrant, being careful not to burn it. If using, pour in the gluten-free white wine and scrape up any browned bits from the bottom of the pot, allowing the wine to reduce by about half, which takes approximately 3-5 minutes.

  3. 3

    Sprinkle the gluten-free all-purpose flour blend over the onions and stir well to coat. Cook for 1-2 minutes, stirring constantly, to cook out the raw flour taste. Gradually whisk in the certified gluten-free chicken or vegetable stock, ensuring no lumps form. Bring the soup to a gentle simmer.

  4. 4

    Reduce the heat to low, cover the pot, and let the soup simmer for at least 15-20 minutes to allow the flavors to meld beautifully. Season generously with salt and freshly ground black pepper to your taste. While the soup simmers, prepare the croutons.

  5. 5

    Preheat your oven to 375°F (190°C). Toss the gluten-free bread cubes with 1 tablespoon of olive oil on a baking sheet. Spread them in a single layer and bake for 8-10 minutes, or until they are golden brown and crisp. Remove from the oven and set aside.

  6. 6

    To serve, ladle the hot French Onion Soup into oven-safe bowls. Top each bowl with a few of the crispy gluten-free croutons. If desired, sprinkle with grated Gruyere or Swiss cheese and place under the broiler for 1-2 minutes until the cheese is melted and bubbly, creating a delightful cheesy crust.

Nutrition (per serving)

267
Calories
21g
Protein
33g
Carbs
17g
Fat
5g
Fiber
529mg
Sodium

Tips & Notes

  • Softened butter should hold a fingerprint but not be greasy — if it melts on touch, it's too warm for creaming.
  • If substituting olive oil for butter, use about 3/4 the amount (olive oil is 100% fat, butter is ~80%).
  • Press or mince garlic rather than slicing for a more pungent flavor; slice for a milder taste.

Learn More

Gluten Free Recipes Team

Celiac-safe recipe development and testing since 2026

Our team develops and tests every recipe to be 100% gluten-free, verifying ingredients, techniques, and cross-contamination risks. We focus on making gluten-free cooking as delicious and accessible as possible. Learn more about us.

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