01 -
Preheat oven to 350°F (175°C).
02 -
Brown ground beef and chopped onion in a large skillet over medium heat until beef is no longer pink.
03 -
Drain excess fat, then stir in diced tomatoes, cream of mushroom soup, garlic powder, Italian seasoning, salt, and black pepper.
04 -
Fold in cooked pasta and mix thoroughly until evenly combined.
05 -
Transfer the mixture into a greased baking dish and evenly sprinkle shredded cheddar cheese over the top.
06 -
Bake for 25 to 30 minutes until the cheese is fully melted and bubbling.
07 -
Allow casserole to rest for a few minutes before serving.