Simple Baked Macaroni with three Cheeses (With Video)

1 lb of Elbow Macaroni

1 lb Yellow Extra Sharp Cheddar Cheese

1 lb Pepper Jack Cheese

1/2 lb Colby Cheese

1 9x9 baking pan (cast iron is optional)

1 stick butter

1 Egg

1 lb Pepper Jack Cheese

1/2 lb Colby Cheese

1 cup 2% milk

Watch video for directions