Boil pasta until almost done. Rinse with cool water and set aside. (Mix in just a bit of oil or butter to keep it from sticking)

Set oven to 375

Make a roux by melting butter on medium then adding flour, salt, pepper, and mustard, and paprika (save a bit of paprika to sprinkle on top). Stir or whisk continously for 3 minutes.

Make a white sauce by adding the milk and stirring constantly until it's thick (about ten minutes but it will get thick).

Turn off burner and add 4 cups cheese. Stir until smooth.

Add sauce to noodles. Put in 9x13 dish sprayed with pam. Cover with panko and remaining cheese. Sprinkle paprika on top.

Bake for thirty minutes or until the panko browns and is bubbly around the edges.