Cook pasta, reducing cooking time by 5 minutes. Meanwhile, saute beef and onions until beef is well browned. Use 2 large skillets or brown half at a time. Add mushrooms and garlic and cook 3 minutes. Drain ziti. Combine meat mixture, sauce, wine, oregano, salt and pepper. Add ziti and mix. Pour into 2 greased 13 x 9 inch baking dishes and sprinkle with cheese. Cover with foil. Bake at 350 degrees for 35-40 minutes. Serve with sour cream. Makes 8 servings.