Preheat oven to 400 degrees F

Cook and drain elbow noodles

In a large saucepan add evaporated milk and 1 Tbls of the butter on a low flame. Wisk in dry mustard

Cube cheddar cheese into 1.5-2 inch cubes set aside

Add in 4 cubes of cheese and allow to melt whisking occasionally. Do not allow the milk to boil. Continue this process until all the cubed cheese has been added and melted. The cheese sauce will thicken while doing this. At the end of this process add the salt and pepper.

Butter a glass baking dish add cooked pasta and pour in 1/2 cheese sauce, mix and add the rest of the sauce. Top with shredded mozzarella cheese, bake in oven for 45 minutes until the top is brown.