This is what I have figured out..
-cheese (I like the blend of parm, asiago, and romano..)
You cook your noodles, drain them and return them to the pot. Melt about 2-4 tablespoons of the butter in the warm noodles, add garlic to taste (I like to use garlic salt too..) and return to the stove. With the heat still on medium, add the cream and stir until it bubbles. Then add the cheese. Usually a half cup to a cup. Stir well.. This has worked better than any packaged mix, everyone loves it! It is Lynn's favorite and she's the pickiest eater in the house..