Instructions

  1. Cook macaroni in boiling water until tender; drain.
  2. Combine macaroni, onion, butter, mushroom soup, tuna, salt and milk. Put in 8"x8" casserole dish.
  3. Sprinkle with grated cheese and crumbled potato chips or bread crumbs if desired.
  4. Cover with foil and bake at 350 degrees for 20 minutes. Remove foil and bake an additional 5 minutes.