Tasty Baked Mac N Cheese

• 1 (16 ounce) package elbow macaroni
• 1/2 teaspoon salt
• 3/4 cup 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
• 1/2 teaspoon salt
• 1/2 teaspoon ground cayenne pepper
• 1 cup milk
• 1 (8 ounce) package shredded mild Cheddar cheese

1. Preheat oven to 375 degrees F (190 degrees C). Line a 9x13-inch baking dish with parchment paper.
2. 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.
3. 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.
4. 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.
5. Bake in the preheated oven until heated through and cheese topping has melted, about 15 minutes.

elbow macaroni, salt, butter, sour cream, cream cheese, cheddar cheese, egg yolk, flour, salt, ground cayenne pepper, milk, cheddar cheese

Taken from www.allrecipes.com/recipe/230283/tasty-baked-mac-n-cheese/ (may not work)