Cook your noodles to your desire. Preheat oven to 325 degrees F. Make cheese sauce: mix the butter and flour. Then add the milk and 2 bags of Kraft Cheese. Add the sauce to the drained noodles and mix together.
Then take your two other bags of cheese and a casserole dish and do a layer of Kraft Cheese, and a layer of cheese and noodles, and a layer of cheese, and a layer of cheese and noodles and a layer of cheese.
Bake in the oven till golden brown on top (approx. 30 minutes). Let it stand for 10 to 15 minutes before serving, and enjoy.