Dice onion and slice chicken into bite-sized pieces.
Add all ingredients except cream and rice into slow cooker and stir to combine.
Cover and cook on high for 3-4 hours or low for 6-8.
Stir in heavy cream and replace cover to let it heat through while you make the rice.
Cook rice according to package directions.
Serve rice topped with chicken and with a side of naan if desired.
