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–+ servings

French Onion Soup Recipe

Author: Natalie Carter
A comforting and rich bowl of French onion soup made with caramelized onions, hearty broth, and topped with gooey cheese.
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Prep Time 15 minutes
Cook Time 45 minutes
Total Time 1 hour
Course Soup
Cuisine French
Servings 4 servings
Calories 400 kcal

Ingredients
  

  • 4 tablespoons Unsalted butter
  • 5 large Yellow onions, thinly sliced
  • 1 teaspoon Salt
  • 1 teaspoon Granulated sugar
  • 2 cloves Garlic, minced
  • 32 oz Beef broth, low-sodium
  • 24 oz Chicken broth, low-sodium
  • 1 tablespoon Worcestershire sauce
  • 2 sprigs Fresh thyme
  • 1 Bay leaf
  • 0.5 tablespoon Balsamic vinegar
  • Salt and pepper, to taste

For the Topping

  • 5 slices French bread, 1-inch thick
  • 2 tablespoons Olive oil
  • 1.5 cups Gruyere cheese, shredded
  • 0.25 cups Mozzarella cheese, shredded
  • 2 tablespoons Parmesan cheese, finely grated

Instructions
 

  • Melt the butter in a large pot over medium heat. Add the sliced onions and cook until they soften, stirring often.
  • Sprinkle in the salt and sugar, then let them cook slowly until they are deep golden and syrupy, about 30-40 minutes.
  • Stir in the minced garlic and let it cook briefly until fragrant.
  • Pour in the beef and chicken broth, stirring well to combine.
  • Add the Worcestershire sauce, thyme sprigs, and bay leaf. Let the broth simmer gently for about 20 minutes to blend the flavors.
  • Allow the soup to simmer until the flavors meld, about 10-15 minutes. Remove the thyme and bay leaf.
  • Stir in the balsamic vinegar. Adjust seasoning with salt and pepper to taste.
  • Brush the bread slices with olive oil and broil them in the oven until crisp and golden brown.
  • Ladle the soup into oven-safe bowls. Top each bowl with toasted bread and sprinkle the Gruyere, Mozzarella, and Parmesan cheeses on top.
  • Broil until the cheese is melted and bubbly.
  • Remove from the oven and let cool slightly before serving.

Notes

  • Take your time when caramelizing the onions for the best flavor.
  • Store leftovers in an airtight container in the fridge for up to 3 days.

Nutrition

Calories: 400kcalCarbohydrates: 35gProtein: 15gFat: 20gSaturated Fat: 10gSodium: 800mgFiber: 2gSugar: 5g
Keyword French onion soup
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