In a large pot, boil pasta in lightly salted water according to package directions. When "al dente," drain and set aside.
2
Make a white sauce by melting half the butter in a pan and adding in the flour. Cook together until flour is fully incorporated. Add milk and stir until smooth. If too thick, add a bit more milk.
3
Add 1 cup of cheese, stir. Again, if too thick, add a bit more milk.
4
Stir the elbows and sauce together, mixing thoroughly. You can add more cheese if you'd like. Place into a glass baking dish.
5
Melt the remaining butter and add to the breadcrumbs. Spread on top of the macaroni and cheese.
6
Bake at 325 degrees for about 30 minutes, until the breadcrumbs are brown.