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Homemade Keto French Onion Soup Recipe

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This Keto French Onion Soup is a comforting, low-carb version of the classic dish. Made with caramelized onions, savory beef broth, and topped with melted cheese, it’s perfect for those following a keto diet. Serve it with a keto-friendly bread or cheese crisps for a crunchy topping without the carbs. It’s rich, flavorful, and super easy to make!

Ingredients

Scale
  • 4 large onions, thinly sliced
  • 4 tbsp unsalted butter (or ghee)
  • 4 cups low-carb beef broth
  • 1 tbsp garlic, minced
  • 1 tbsp fresh thyme (or 1 tsp dried)
  • 1/2 cup dry white wine (optional)
  • Salt and pepper, to taste
  • 1 tbsp Worcestershire sauce (sugar-free)
  • 1/4 tsp xanthan gum (optional, for thickening)
  • 1 cup grated Gruyère or mozzarella cheese
  • Keto bread slices or cheese crisps for topping

Instructions

  1. Caramelize the Onions: In a large pot, melt the butter over medium heat. Add sliced onions and cook slowly, stirring occasionally, for 30-40 minutes until deeply caramelized and golden brown.
  2. Deglaze: Add the white wine (or a bit of broth) and scrape the pot to lift up the browned bits. Simmer until the liquid mostly evaporates, about 5-7 minutes.
  3. Simmer the Soup: Pour in the beef broth, Worcestershire sauce, salt, and pepper. Simmer for 20-25 minutes, allowing flavors to blend. For a thicker consistency, whisk in the xanthan gum at this point.
  4. Prepare Toppings: Toast keto-friendly bread slices or bake cheese crisps at 350°F for 5-7 minutes until crispy.
  5. Assemble: Preheat your broiler. Ladle the soup into oven-safe bowls, top with toasted bread or cheese crisps, and add a generous amount of grated cheese.
  6. Broil: Place bowls under the broiler for 3-5 minutes until the cheese is bubbly and golden brown.
  7. Serve: Carefully remove the hot bowls and serve immediately.

Notes

  • Feel free to skip the wine if you’re strict on carbs, but it does add a rich flavor.
  • If you prefer a thicker soup, use xanthan gum sparingly to avoid a gummy texture.
  • Keto bread alternatives or cheese crisps work great for a crunchy topping.

Nutrition

Find it online: https://www.wellnesswarrior.org/keto-french-onion-soup/