INGREDIENTS
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12 ounces elbow macaroni noodles
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2 cups butter cracker crumbs (such as Ritz)
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3 cups shredded sharp cheddar cheese, divided
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6 tablespoons unsalted butter, melted
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1 (5.2 ounce) package Boursin garlic herb cheese
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2 tablespoons cold unsalted butter
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2 large eggs
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3/4 cup milk
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1/4 cup sour cream
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1/4 teaspoon salt
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Pinch red pepper flakes