INGREDIENTS
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Ingredients
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1 large sweet onion, thinly sliced
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1 tablespoon olive oil
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1/2 cup beef broth
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4 garlic cloves, minced, divided
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1/4 teaspoon dried thyme
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1/4 cup butter, softened
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1 loaf (1 pound) French bread, sliced
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2 tablespoons grated Parmesan cheese
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2 cups (8 ounces) shredded Gruyere or Swiss cheese