in a large skillet, cook beef,onion and green pepper over medium heatuntil the meat is no longer pink and the vegetables are tender;drain.Add the next nine ingredients and mix well.stir in noodles and mushrooms.
transfer to a greased 13-in. x 9-in.x2-in. baking dish.sprinkle with cheese. bake, uncovered, at 350 for 45 minutes oe until heated through.