Cheese and Tomato Skilletburger

1 lb. ground beef
1/2 cup chopped onion
1/2 tsp. oregano
1 can Cheddar Cheese Soup
1 cup drained chopped tomatoes
2 cups cooked elbow macaroni
1/2 tsp. salt

In skillet, brown beef and cook onion with oregano until tender. Pour off fat. Add remaining ingredients. Heat thoroughly, stirring occasionally.