"Transform a classic soup into an easy, cheesy entrée with this crowd-friendly recipe for French Onion Mac and Cheese...."
INGREDIENTS
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10 Tablespoons unsalted butter, divided
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2 small yellow onions, thinly sliced
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2 cloves garlic, minced
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2 teaspoons fresh thyme leaves, minced
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1 bay leaf
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1/4 cup dry sherry or white wine
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2 teaspoons beef bouillon paste
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2 teaspoons Worcestershire sauce
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1 pound uncooked pasta shells
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4 cups whole milk
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1/2 cup all-purpose flour
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2 cups shredded sharp cheddar cheese
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3 cups shredded mozzarella cheese