Homemade French Onion Soup Recipe

Slow-cooked onions are cooked to perfection, then simmered in broth and spice, and topped with toasted crostini and rich melty cheese!

Course Soup

Cuisine French

Keyword best french onion soup, easy french onion soup, homemade french onion soup, how to make french onion soup

Prep Time 10

Cook Time 1 30

Total Time 1 40

Servings servings

Calories 258kcal

Author Beth Pierce

3 tablespoons unsalted butter
2 tablespoons olive oil
4 large yellow onions sliced in half and cut from pole to pole in no greater than ¼ inch slices
2 cloves garlic minced
1 teaspoon dried thyme
½ cup dry white or red wine see notes
4 cups low sodium beef broth or beef stock
2 cups low sodium chicken broth
2 teaspoons Worcestershire Sauce
1 bay leaf
kosher salt and freshly ground pepper to taste
Crostinis or large croutons
1 cup shredded Gruyère or Swiss cheese

Heat butter and olive oil in a Dutch Oven or stock pot over medium to medium/low heat. Add the onions and cook for about 45 minutes, stirring every few minutes until they are a rich golden brown. If the onions are browning too fast reduce the heat.
Reduce the heat to low. Add the garlic and thyme. Cook for 1 minute while stirring. Add the wine, and using a spoon or spatula, try to remove as much of the brown glazing from the bottom of the pan as possible. Allow the wine to simmer with the onions for about 5 minutes.
Add the chicken broth, beef broth, Worcestershire Sauce, and bay leaf. Simmer for 20 minutes. Discard the bay leaf and season with kosher salt and fresh ground black pepper to taste.
Add the soup to oven-safe bowls or cups. Top with crostini and grated cheese. Slip under the broiler for 2-3 minutes.

Caramelized onions are the star of this show, so don't cut the process short.
Broilers are very unpredictable. Stay close by and monitor well.
Leftover soup should be stored in an airtight container in the refrigerator. Waiting to add the crostini and cheese is best until you reheat.