Homemade Baked Mac and Cheese

the whole recipe here

Ingredients

1 (8-ounce) package elbow macaroni
2 cups milk (I use whole milk)
1/4 cup all-purpose flour
1 teaspoon onion salt
2 (10-ounce) blocks sharp Cheddar cheese, shredded and divided ( I use one block of Sharp Cheddar and one block of Extra-Sharp Cheddar cheese)
1 cup soft plain breadcrumbs ( The recipe suggest homemade breadcrumbs, but I use store bought - not Italian breadcrumbs, just plain)
1/4 cup butter or margarine, melted (I use butter)

COOK macaroni according to package directions; drain well. Set aside.

PLACE milk, flour, and onion salt in a quart jar; cover tightly, and shake vigorously 1 minute.