This is Cheesy is so many ways. A classic inexpensive dish that everyone loves.
Brown 1 pound of ground beef with a medium chopped onion. Drain.
Stir in a can (14 1/2 oz) of Diced tomatoes with basil, garlic & oregano undrained.
Add 1/4 cup of ketchup & 1 cup cooked macaroni and season. Stir.
Top with 1 cup of shredded Cheddar cheese.