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Ingredients
▢3 tablespoons butter
▢1/2 tablespoon olive oil
▢2 pounds (about 3) yellow onions, thinly sliced
▢1/2 teaspoon granulated white sugar
▢1/4 teaspoon salt
▢1/8 teaspoon pepper
▢2 tablespoons all purpose flour
▢6 cups beef broth
▢1 whole bay leaf
▢8 slices baguette
▢4 ounces (1 cup) grated Gruyere cheese
▢1 ounce (1/4 cup) freshly grated Parmesan cheese
▢fresh thyme for garnish, optional
Instructions
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