Prepare macaroni and cheese dinner as directed. Preheat oven to 300 degrees F.
Remove macaroni and cheese from stove and place in a casserole dish. Add sliced hot dogs, soup, milk, and cheddar cheese (I usually add about 2 handfuls, but if you like cheese, add more). Stir. Top with more cheddar cheese.
Bake in oven for about 20 minutes or until cheese has melted throughout.