Preheat oven to 350 degrees F.
Cook macaroni "al-dente" according to package directions, immediately drain in a colander and rinse with cold water.
Set pasta aside.
Melt butter in a saucepan over medium heat.
Blend in flour, salt, peppers and dry mustard with a whisk, then add milk.
Cook until beginning to thicken and smooth.
Add half of the cheese and stir until blended.
Pour macaroni into a 9x13" pan sprayed with cooking spray and add cheese mixture. Stir until mixed and then top with remaining cheese.
Sprinkle with paprika and bake for 25-30 minutes until set and lightly golden on top.