This Philly Cheesesteak French Onion Soup combines two of my favorite things -- the rich cheesiness of a classic French onion soup and a hearty Philly cheesesteak sandwich. Caramelized onions, thinly sliced ribeye, tender bell peppers, aromatic garlic, simmered in a rich broth, topped with melty gruyere and provolone cheeses. It is even keto, low carb and gluten free.
Ingredients in Keto French Onion Soup
How to make the best Keto French Onion Soup
Step by Step Instructions
STEP 1: Thinly slice the onions and bell peppers.
STEP 2: Slice the bun into 8 slices.
STEP 3: Thinly slice the ribeye steak.
STEP 4: Heat 3 tablespoons of the oil in a large Dutch oven or soup pot over medium heat. Add the onions to the pan and sauté until soft, about 12 minutes.
STEP 5: Add the butter and continue cooking the onions until they start to brown, about 10 minutes.
STEP 6: Add the Worcestershire sauce, garlic, thyme, bay, salt, and pepper. Mix in and cook for 5 minutes.
STEP 7: Deglaze the pan with the cooking sherry, and using a rubber spatula, scrape up and mix in any bits that are stuck to the bottom of the pan. Add the beef broth to the pan, bring to a boil, and reduce the heat to low and let simmer for 25 minutes.
STEP 8: While the broth is simmering, heat the remaining 1 tablespoon of olive oil in a large skillet over medium heat. Add the peppers to the pan, sprinkle with a little salt and pepper, and sauté for 5 minutes.
STEP 9: Add the steak to the pan and cook until it reaches your desired level of doneness. Add the cooked peppers and steak to the soup.
STEP 10: Discard the bay leaves and divide the soup evenly between 4 large oven proof ramekins or small oven-proof bowls. Top each one with 2 pieces of toasted bun.
STEP 11: Place a slice of provolone cheese on top of each ramekins and, divide the gruyere cheese evenly among the 4 ramekins.
STEP 12: Preheat the oven to broil. Place the ramekins under the broiler and cook until the cheese is bubbly and brown. Garnish with fresh thyme and a sprinkle of black pepper before serving.
More Keto Philly Cheesesteak Recipes
Recipe Tips and Variations
Frequently Asked Questions
French onion soup is traditionally made with yellow onions, but you can also use white, red, or a medley of all three.
Gruyere and provolone are my favorite cheeses to use for French onion soup, but mozzarella, gouda, havarti, sharp white cheddar, Swiss, or parmesan are all delicious choices as well.
Traditional French onion soup is not keto friendly as it is very high in carbs. Not only is it made with regular bread, but the main ingredient is onion, which is a higher carb vegetable. But this keto version uses low carb buns and that really cuts back on the carb count. That being said, due to the higher carb count of onions, this soup is higher in carbs than you might expect, but can still easily be worked into a low carb diet.
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