Cook the macaroni pasta according to package directions
While the pasta is cooking, heat the oil over med-high heat in a large pot
Add in the ground beef & brown
When the beef is browned, remove some of the liquid/fat if there is more than a couple of tablespoons there & stir in the celery & onion
Cook for a few minutes, until the celery & onion have softened
Stir in the cans of tomatoes, & bring to a simmer
Stir in the cooked macaroni pasta
Break up the American cheese into small portions & add to the pot
Stir frequently so the cheese melts & makes a creamy sauce
Add salt/pepper to taste
Serve & enjoy!