Foryoueats: Creamiest Mac And Cheese

cooking spray

1 (16 ounce) package elbow macaroni

4 teaspoons kosher salt, divided

2 (8 ounce) packages sharp Cheddar cheese

6 tablespoons butter

⅓ cup all-purpose flour

¼ teaspoon ground mustard

3 ½ cups whole milk, or more to taste

3 ounces cream cheese, softened

½ teaspoon ground black pepper

⅛ teaspoon cayenne pepper (Optional)

Creamiest Mac And Cheese