Keto French Onion Soup – Low Carb

Table of Contents

Description

This Keto French Onion Soup brings all the rich, deep flavors of the classic dish without the carbs! Made with caramelized onions in a savory beef broth and topped with gooey melted cheese over a low-carb bread substitute, this soup is comforting and perfect for cold weather.

Ingredients

For the Soup:

2 large yellow onions, thinly sliced
2 tbsp butter (or ghee for dairy-free)
2 tbsp olive oil
2 cloves garlic, minced
1 tsp salt
½ tsp black pepper
1 tsp thyme (dried or fresh)
½ tsp erythritol or monk fruit sweetener (optional, to balance flavors)
4 cups beef broth (low sodium preferred)
1 tbsp Worcestershire sauce (or coconut aminos for strict keto)
½ cup dry white wine (or extra broth if avoiding alcohol)
1 tbsp balsamic vinegar (for depth of flavor, optional)

For the Topping:

½ cup shredded Gruyère cheese (or Swiss cheese)
¼ cup Parmesan cheese (for extra crispiness)
2 slices low-carb bread (or homemade keto bread, chaffles, or cheese crisps)

Instructions

1. Caramelize the Onions

Heat butter and olive oil in a large saucepan over medium heat.
Add sliced onions and cook slowly, stirring occasionally, until golden brown and caramelized (about 30-40 minutes). Be patient—this step is key!
Stir in garlic, salt, pepper, thyme, and erythritol (if using).

2. Deglaze and Simmer

Pour in white wine to deglaze the pan, scraping up the browned bits. Let it cook for 2-3 minutes until reduced.
Add Worcestershire sauce, balsamic vinegar, and beef broth. Bring to a gentle simmer and let it cook for 15-20 minutes.

3. Prepare the Topping

While the soup simmers, preheat the oven to 375°F (190°C).
Toast low-carb bread or a keto substitute until crisp.
Ladle the soup into oven-safe bowls, place a piece of toasted bread on top, and sprinkle with Gruyère and Parmesan cheese.

4. Broil & Serve

Place the bowls under a broiler for 2-3 minutes until the cheese is melted and bubbly.
Serve hot and enjoy your low-carb French onion soup!

Notes & Tips

✅ Caramelizing Onions: Be patient; slow cooking over low heat develops the best flavor. Stir occasionally to prevent burning.
✅ Bread Alternatives: Use chaffles, cheese crisps, or keto crackers if you don’t have low-carb bread.
✅ Cheese Options: Traditional Gruyère is best, but you can use Swiss, Provolone, or Mozzarella.
✅ Extra Thickness: To make the soup thicker, you can add a small amount of xanthan gum (¼ tsp).
✅ Wine Substitutes: If avoiding alcohol, just increase the beef broth or use a mix of broth + a splash of apple cider vinegar.

Servings & Nutrition

Serving Size: 1 bowl (makes 4 servings)

Calories: 250
Fat: 18g
Protein: 9g
Net Carbs: 6g
Fiber: 2g
Total Carbs: 8g

Health Benefits of Keto French Onion Soup

🥑 Low-Carb & Keto-Friendly: Keeps you in ketosis while satisfying cravings.
🧅 Rich in Antioxidants: Onions provide quercetin, which has anti-inflammatory properties.
💪 High in Healthy Fats: Butter and cheese provide energy and satiety.
🍖 Protein-Packed: The beef broth adds collagen and essential amino acids.

Q&A

❓ Can I make this ahead of time?
✅ Yes! The soup base can be made 1-2 days in advance and stored in the fridge. Add the cheese topping and broil just before serving.

❓ What’s the best low-carb bread for this recipe?
✅ Chaffles (cheese waffles), keto mug bread, or almond flour bread work great.

❓ Can I make it dairy-free?
✅ Use ghee or coconut oil instead of butter and skip the cheese topping or use dairy-free cheese.

❓ What broth should I use?
✅ Opt for homemade beef bone broth or a store-bought version with no added sugars or preservatives.

Final Thoughts

This Keto French Onion Soup is rich, savory, and completely guilt-free. It delivers all the traditional flavors while keeping your carbs in check. Whether you’re on a keto diet or just love a good bowl of soup, this recipe is a must-try!

Would you like suggestions for more keto-friendly meals? 😊