Light French Onion Soup

Yunhee Kim
French onion soup is the perfect go-to for cold winter days. Serve hot and bubbly, top with melted Gruyère, and your family will never know this recipe is light.


Makes 4 servings (serving size: 1 3/4 cups soup and 2 toasts)

Recipe Time

Prep: 15 Minutes
Cook: 50 Minutes

Nutritional Information

Calories 307
Fat 18 g
Satfat 8 g
Monofat 7 g
Polyfat 1 g
Protein 18 g
Carbohydrate 19 g
Fiber 2 g
Cholesterol 39 mg
Iron 1 mg
Sodium 392 mg
Calcium 331 mg


1 tablespoon unsalted butter
1 tablespoon olive oil
3 large thinly sliced Spanish onions
1/4 teaspoon kosher salt
1 teaspoon sugar
1 tablespoon flour
1/3 cup dry sherry
6 cups reduced-sodium chicken stock
1/4 teaspoon freshly ground black pepper
2 teaspoons reduced-sodium soy sauce
4–8 (3/4-inch) slices French baguette
4 ounces Gruyère cheese, sliced


1. Preheat oven to 400°. Heat butter and olive oil in a heavy skillet over medium-high heat. Add onions and salt. Cover; cook 5 minutes. Uncover; add sugar. Cook, stirring frequently, 25 minutes or until onions are golden. Add flour, and reduce heat to medium-low; cook 1–2 minutes. Add sherry, scraping pan to loosen browned bits. Cook 1–2 minutes or until slightly reduced. Transfer to a saucepan. Add stock and pepper. Boil; reduce heat to low, and simmer, covered, 10 minutes. Add soy sauce.

2. Place bread slices on a baking sheet; bake 7 minutes per side or until golden.

3. Heat broiler. Ladle soup into ovenproof bowls. Top with 1–2 bread slices and 2 slices Gruyère. Broil 1–2 minutes or until cheese is bubbly.