Brown meat and onion; drain. Cook noodles until tender; drain. Add remainder ... ingredients. Pour into casserole dish. Melt butter, then add ... 20 to 30 minutes.
Heat oven to 350 degrees. ... soft. Add ground beef. Cook until brown. Combine ... a greased 2-quart casserole dish with cooked noodles. Mix well. Cover and ... of baking, if desired.
Ingredients: 7 (beef .. macaroni .. mushrooms .. salt ...)