In a slow cooker, add the chicken, onion, garlic, ginger, tomatoes, tomato paste, cayenne, coriander, salt and pepper. Stir to combine.
Cook on high for 4 hours, or low for 8 hours.
Add in the yogurt, cilantro and garam masala. Stir to combine, let cook 5 more minutes.
Serve over a bed of jasmine rice.
