*disclaimer-I am not knocking the blue box, I know of many people who are very loyal to this product, I never really liked it.
And this method is just as fast as the box!
4 tablespoons butter (nothing else)
4 tablespoons flour
24 ounces milk
cheese (lots of cheese shredded)
*can use 1 or a few...I like good ole cheddar
1 1/2 cups elbow macaroni+a little more (I don't measure, I just pour)