To make jerk seasoning, add all ingredients (except chicken and oil) to food processor and pulse until mixed
Grease slow cooker with oil and place chicken inside
Top chicken with jerk mixture
Cook on low for 2 hours, baste chicken with juices
Turn chicken over, cook or 2 more hours on low
Before serving, broil chicken in oven to crisp up and pour remaining juices on top, about 5 minutes