Ingredients:

3 tablespoons unsalted butter

3 large sweet onions, thinly sliced

2 cloves garlic, minced

Salt and pepper to taste

1 teaspoon thyme (fresh or dried)

2 tablespoons all-purpose flour

1/2 cup dry white wine

2 cups beef broth

1 cup chicken broth

6 slices day-old French bread or baguette, toasted

1 1/2 cups grated Gruyère cheese

1/2 cup grated Parmesan cheese

1/4 cup fresh parsley, chopped (for garnish)

Cooking spray