Gather all of the ingredients.
Bring a large pot of lightly salted water to a boil.
Add the elbow macaroni and cook until tender but still slightly firm, about 8 minutes. Drain well.
While the pasta cooks, melt the butter in a medium saucepan over medium heat.
Whisk in the flour, salt, and black pepper until smooth. Cook for about 5 minutes, stirring frequently.
Slowly pour in the milk while whisking continuously. Cook until the sauce becomes smooth and begins to bubble, about 5 minutes.
Stir in the shredded Cheddar cheese until completely melted and the sauce is creamy.
Fold the cooked macaroni into the cheese sauce until evenly coated. This Simple Macaroni and Cheese is ready to serve immediately while hot.