COMBINE macaroni and raw chicken with hot water in a 10 cup (2.5 L) microwaveable bowl. Cover, and place bowl on a microwaveable pie plate for 'spill over'.
MICROWAVE on HIGH for 12 minutes.
STIR in all remaining ingredients excluding onions. Re-cover and microwave on HIGH for an additional 3 minutes. Stir in onions. Let stand for 5 to 10 minutes.