Preheat oven to 350 degrees. In a large skillet, thoroughly brown beef; remove meat and set aside. In the same skillet, saute onion in butter until onion is translucent; drain fat. In a large bowl combine beef, sauteed onion, spaghetti sauce, macaroni, 1 cup cheese, mushrooms, basil, garlic powder, oregano, salt and pepper. Spoon into an 11 x 7 inch baking dish. Bake covered 20 minutes or until bubbly. Evenly sprinkle with 1/2 cup cheese; bake 5 minutes or until cheese melts.
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