Cook the egg noodles according to the package directons.
Preheat oven to 400ºF.
Cook the hamburger and onion. Combine and mix together everything else except the noodles. Add the meat mixture and blend in most of the cheese, keeping enough to sprinkle on top. When the noodles are cooked, drain them and fold them into the meat mixture.
Sprinkle the top with the remaining cheese and bake at 400ºF for 20 minutes.
This casserole recipe is great served with a green salad and a side vegetable like peas or green beans.