Macaroni & Cheese with a kick

Macaroni & Cheese with a kick, just a hint of mustard, kicks this dish to the
top of delicious. I made this dish and everyone said how good it was, it was my new secret ingredient, something as simple as mustard kicked Macaroni and Cheese to the next level,
you could also throw in some pepper jack or hot sauce both gives it a great taste
Things you will
1 lb Macaroni Box
5 Cups Milk
4 Cups Cheddar Cheese
1/2 Cup Flour
1/2 Cup Butter
Salt & Pepper to taste