Keto French Onion Soup

My keto French onion soup recipe features caramelized onions swimming in warm broth with crusty bread and melty cheese. It’s made with no flour, no thickeners, and only 3 grams of net carbs!

Course Appetizer

Cuisine French

Prep Time 5

Cook Time 20

Total Time 25

Servings servings

Calories 171kcal

Author Arman Liew

Ingredients

1 ounce butter
4 large onions thinly sliced
1/2 teaspoon allulose or any granulated sweetener
1/2 teaspoon pepper
32 ounces beef broth
3 tablespoons Worcestershire sauce

For the cheesy toasts

2 keto hot dog buns * See notes
1 1/2 cups Gruyere cheese finely shredded
4 springs Thyme loosely torn

Instructions

Preheat the oven to 200C/400F. Line a large baking sheet with parchment paper and set aside.
Place a large soup pot over medium heat. Once hot, add the butter to melt. Add the sliced onions, sweetener, and pepper, and sauté for 8-10 minutes, until tender and caramelized.
Add the beef broth and Worcestershire sauce and bring to a simmer. Once it starts simmering, cover the pot and let it simmer for a further 10 minutes.
While the soup is simmering, prepare the cheesy toasts. Slice your two keto hot dog buns into 6 thick slices, then cut each slice in half. Place the 12 bread pieces on the lined sheet. Sprinkle half the Gruyère cheese over the top. Bake for 6-8 minutes, until golden brown.
Ladle the soup into small bowls. Add 1-2 pieces of the cheesy toast on top of each soup bowl and sprinkle with extra Gruyere cheese and a sprig of thyme.

Notes

* You can also use thickly sliced keto bread or even keto buns.

TO STORE: Store leftover soup (not the bread) in an airtight container in the refrigerator for up to one week.

TO FREEZE: Place the cooled soup in an airtight container and store it in the freezer for up to six months. Thaw overnight in the fridge.

TO REHEAT: Microwave soup in 30-second intervals or reheat in a saucepan until warm. I prefer the saucepan as it heats more evenly.

TO MAKE AHEAD: Prepare the soup up to three days in advance and store it in the fridge. Before serving, warm it on the stove over medium-low heat, then serve with the cheesy croutons.

Nutrition