Arrange chicken in 12x8" microwave-safe baking dish, placing thicker
portions toward edges of dish. Top with mushrooms and onion. Pour
spaghetti sauce over chicken. Cover with waxed paper; microwave on
HIGH 11 min. Rearrange chicken and microwave on HIGH for 11 more mins
on until chicken is nearly done. Let stand, covered, 5 mins or until
chicken is no longer pink in the middle.
TIP: Most chicken recipes suggest that you remove the chicken skin
before microwaving