"A rich macaroni and cheese casserole made with sour cream, butter, and two kinds of Cheddar cheese is ready in less than an hour but is fancy enough for a holiday dinner...."
INGREDIENTS
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1 (16 ounce) package elbow macaroni
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1/2 teaspoon salt
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3/4 cup butter, softened - divided
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1 cup sour cream
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1 tablespoon cream cheese, softened
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1 (8 ounce) package shredded sharp Cheddar cheese
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1 egg yolk
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2 tablespoons all-purpose flour
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1/2 teaspoon salt
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1/2 teaspoon ground cayenne pepper
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1 cup milk
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1 (8 ounce) package shredded mild Cheddar cheese