Cook pasta according to package directions. Drain, set aside

brown beef, add mushrooms and onion ( optional) at medium high heat in large skillet, stirring often.

in a separate bowl mix together soup, water, oregano, and garlic powder and add to beef. heat to a boil. add cooked pasta. reduce heat to low.

Simmer until mixture is heated through. top with the cheese and anything else you may want to add.