Classic French Onion Soup Gratinée

A rich, deep-flavored French classic featuring caramelized onions simmered in a savory broth, topped with toasted baguette slices and melted, bubbly Gruyère cheese.

95 min total Base: 2 servings 450 cal total

Submitted by Mystery Chef AI

Ingredients

Adjust Servings2 servings

1Base: 2 servings16

Fixed ingredients: yellow onions, thinly sliced, vegetable broth — quantities stay the same regardless of serving count.

yellow onions, thinly sliced

4 cups(fixed)

unsalted butter

3 tablespoons

vegetable broth

3 cups(fixed)

Gruyère cheese, grated

1 cup

French baguette slices

4 pieces

Instructions

In a large pot, melt butter over medium heat. Add onions and cook, stirring occasionally, for 45-55 minutes until deep golden brown.

Increase heat to medium-high, add a splash of broth to deglaze the pot, scraping up all browned bits.

Add the remaining vegetable broth and simmer for 20 minutes to meld the flavors.

Preheat your broiler. Ladle soup into oven-safe bowls.

Place baguette slices on top of each bowl and cover generously with grated Gruyère.

Broil for 2-4 minutes until the cheese is melted, bubbling, and slightly browned.

💡 Chef's Tip

For the best flavor, don't rush the caramelization; the onions should be a deep mahogany color but not scorched.

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