Prep Time::30 mins
Cook Time::25 mins
Total Time::55 mins
Servings::12
Ingredients
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1 (16 ounce) package elbow macaroni
½ teaspoon salt
¾ cup salted butter, softened – divided
1 cup sour cream
1 tablespoon cream cheese, softened
1 (8 ounce) package shredded sharp Cheddar cheese
1 egg yolk
2 tablespoons all-purpose flour
½ teaspoon salt
½ teaspoon ground cayenne pepper
1 cup milk
1 (8 ounce) package shredded mild Cheddar cheese
Directions
Preheat the oven to 375 degrees F (190 degrees C). Line a 9×13-inch baking dish with parchment paper.
Bring a large pot of water to a boil. Cook elbow macaroni in the boiling water, stirring occasionally until almost cooked through and firm to the bite, about 7 minutes. Drain and transfer to a large bowl. Sprinkle macaroni with 1/2 teaspoon salt and stir 1/2 cup butter into the pasta.
Mix 1/4 cup butter, sour cream, cream cheese, sharp Cheddar cheese, and egg yolk together in a bowl. Stir flour, 1/2 teaspoon salt, cayenne pepper, and milk into the sour cream mixture.
Spread 1/4 cup sour cream sauce over bottom of prepared baking dish. Stir remaining sour cream sauce into macaroni. Pour macaroni into baking dish atop sauce layer; sprinkle mild Cheddar cheese over the casserole.
Bake in the preheated oven until heated through and cheese topping has melted, about 15 minutes.