onion, finely chopped
green bell pepper, diced
In a deep, 3-quart, heat-resistant, non-metallic casserole place 5 cups water, 1 tablespoon salt and 3 cups uncooked noodles.
Heat, covered, in microwave oven 12 minutes or until noodles are tender.
Drain noodles and set aside.
In a large, heat-resistant, non-metallic mixing bowl, me1t 1/4 cup butter in microwave oven 30 seconds.
Add bread crumbs and heat, uncovered, in microwave oven 1 1/2 minutes or until bread crumbs are golden brown.
Add meat to bread crumb mixture and mix to combine well.
Heat, uncovered, 5 minutes or until meat is browned, stirring occasionally so meat crumbles.
Add onions, green pepper, garlic salt, salt and pepper.
Blend into meat mixture thoroughly.
Heat, uncovered, in microwave oven 2 minutes.
In a 2-quart, heat-resistant, non-metallic casserole layer cooked noodles with meat mixture.
Top with cheese, tomato sauce and mushrooms (in that order).
Heat, uncovered, in microwave oven 8 minutes or until cheese melts.