INTRODUCTION
Keto French Onion Soup is a delicious twist on the classic comfort food. It combines rich flavors from onions and beef broth with melty cheese to create a warming dish perfect for any occasion. The best part? This version is low in carbohydrates, making it a great option for those following a keto diet.
WHY YOU WILL LOVE THIS RECIPE
There are many reasons to love Keto French Onion Soup. First, it’s packed with flavor. Sweet, caramelized onions mixed with savory beef broth create a taste that’s hard to resist. The Gruyere cheese on top adds a creamy texture that perfectly complements the soup.
Second, this recipe uses simple ingredients that are easy to find. Whether you’re a seasoned cook or just starting out, you will find this recipe straightforward.
Lastly, it’s a hearty dish. It warms you up on cold days and makes for a fantastic appetizer or a light meal. You can enjoy this soup without worrying about high-carb counts, making it an excellent choice for those watching their diet.
HOW TO MAKE Keto French Onion Soup
Making Keto French Onion Soup is simple and rewarding. Just follow these steps, and you will create a comforting bowl of goodness that your family and friends will appreciate.
EQUIPMENT NEEDED
- Large soup pot
- Baking sheet
- Parchment paper
- Sharp knife
- Cutting board
- Ladle
- Oven
Ingredients You’ll Need
- 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
- 2 keto hot dog buns
- 1 1/2 cups Gruyere cheese (finely shredded)
- 4 springs thyme (loosely torn)
STEP-BY-STEP INSTRUCTIONS
- Preheat Your Oven: Start by preheating your oven to 200°C (400°F). While the oven heats, you can prepare your baking sheet by lining it with parchment paper.
- Cook the Onions: Place a large soup pot over medium heat. Once it is hot, add the butter to melt. Then, add the sliced onions, sweetener, and pepper. Sauté the onions for about 8-10 minutes until they soften and take on a golden color.
- Add Broth and Simmer: Pour in the beef broth and Worcestershire sauce. Bring the mixture to a simmer. Once it begins to simmer, cover the pot and let it cook for another 10 minutes. This will help the flavors blend beautifully.
- Prepare Cheesy Toasts: While your soup simmers, you can prepare the cheesy toasts. Take your two keto hot dog buns and slice them into six thick pieces, then cut each one in half. Place all twelve pieces on the lined baking sheet. Sprinkle half of the Gruyere cheese over the top. Bake in the oven for 6-8 minutes, or until they look golden brown.
- Serve the Soup: Now it’s time to serve! Ladle the soup into small bowls. Add 1-2 pieces of cheesy toast on top of each bowl and sprinkle with extra Gruyere cheese. Finish with a sprig of thyme for an added touch.
HOW TO SERVE Keto French Onion Soup
You can serve Keto French Onion Soup as a delightful appetizer or as a light main meal. Pair it with a simple green salad for a complete keto-friendly dining experience. The cheesy toasts on top make each bowl look appetizing and inviting.
STORAGE & FREEZING: Keto French Onion Soup
If you have leftovers, you can store them in an airtight container in the refrigerator. They will stay fresh for about 3-4 days. To reheat, just warm the soup on the stove over medium heat until hot. If you want to freeze it, let the soup cool completely before pouring it into a freezer-safe container. It can be frozen for up to 2-3 months. When you’re ready to enjoy it again, thaw it in the fridge overnight before reheating.
SERVING SUGGESTIONS
Keto French Onion Soup pairs well with several sides. A fresh garden salad or some roasted vegetables can complement the flavors nicely. You can also enjoy it with other low-carb dishes like grilled chicken or steak for a satisfying meal.
VARIATIONS
You can get creative with Keto French Onion Soup! Here are a few variations to try:
- Different Cheeses: While Gruyere is traditional, you can use mozzarella, cheddar, or Swiss cheese based on your preference.
- Herbs: Add different herbs like rosemary or basil for a unique twist.
- Add Protein: Throw in some shredded cooked chicken for a heartier soup.
FAQs
1. Can I use another type of broth?
Yes! You can use chicken broth or vegetable broth if you prefer. However, beef broth adds a rich flavor.
2. Can I skip the sweetener?
If you don’t have sweetener or prefer not to use it, you can omit it. The natural sweetness of the onions will still shine through.
3. Is this soup gluten-free?
Yes, as long as you use gluten-free Worcestershire sauce and keto buns, this dish can be gluten-free.
4. Can I make this soup in advance?
Absolutely! You can make it a day ahead. Just store it in the fridge, and it will taste even better the next day as the flavors develop more.

MAKE-AHEAD TIPS FOR Keto French Onion Soup
If you want to make your life easier, you can prepare some parts of the dish in advance. Slice and store the onions in the fridge the night before. You can also mix the broth and Worcestershire sauce ahead of time. This way, when you’re ready to cook, you can simply combine everything and let it simmer.
Keto French Onion Soup is truly a comforting and satisfying dish. By following this simple recipe, you can enjoy a hearty meal while staying on track with your keto lifestyle. Whether you’re serving it for a special gathering or enjoying it as a warm weeknight meal, this soup is sure to please. Enjoy!

Keto French Onion Soup
Ingredients
Method
- Preheat your oven to 200°C (400°F). Line a baking sheet with parchment paper.
- In a large soup pot over medium heat, melt the butter. Add the sliced onions, sweetener, and pepper. Sauté for about 8-10 minutes until the onions are soft and golden.
- Pour in the beef broth and Worcestershire sauce. Bring the mixture to a simmer, cover the pot, and let it cook for another 10 minutes.
- While the soup simmers, prepare the cheesy toasts. Slice the keto hot dog buns into six thick pieces each and place them on the lined baking sheet. Sprinkle half of the Gruyere cheese over the top.
- Bake in the oven for 6-8 minutes, or until the buns are golden brown.
- Ladle the soup into bowls. Top each bowl with 1-2 pieces of cheesy toast, sprinkle with extra Gruyere cheese, and garnish with a sprig of thyme.

