Cook rice as directed on package. Cook chicken -- you can either grill your chicken or pan cook.
Pour in a large pan the pineapple; juice and all. In can mix 1/2 can juice with about three spoons of cornstarch and add to pan -- this will thicken when it boils. Now is when you would add the options, let it heat up. If it gets too thick, thin it down with pineapple juice.
When ready, put scoop of rice on plate. Pour pineapple sauce over rice and chicken if desired, and enjoy.