In a skillet, saute the onion, green pepper and garlic in butter for 5 minutes or until tender. Remove from the heat. Stir in tomatoes and parsley; set aside. In a large bowl, combine the remaining ingredients. Stir in reserved vegetables.
Pour into an ungreased 9-in. pie plate. Bake, uncovered, at 350° for 25-30 minutes or until a knife inserted in the center comes out clean. Let stand for 5 minutes before cutting.