Cook the flour for a few minutes to get the raw flour taste out of it slowly.
Whisk in the 3 cups of whole milk.
Add the 16 ounces of white American cheese, 8 ounces of freshly grated medium cheddar, and 8 ounces of freshly grated sharp cheddar, stirring until the cheese melts slowly.
Cook 1 pound of large elbow macaroni for 7 minutes.
Add the macaroni to the cheese mixture in a oven-safe dish.
Top with crushed Cheez its and a layer of Cheddar Jack cheese.
Bake at 400 degrees for 20 minutes.
