Spray 4-quart slow cooker with cooking spray. Set oven control to broil. Spray broiler pan rack with cooking spray. Place half of the drummettes on rack in pan. Broil 3 inches from heat 20 minutes, turning after 12 minutes, or until lightly browned. Transfer drummettes to slow cooker. Repeat with remaining drummettes.
In medium bowl, mix soy sauce, honey, butter, lime juice and red curry paste. Pour sauce over drummettes in slow cooker; toss lightly to coat with sauce.
Cover; cook on Low heat setting 4 hours. Remove drummettes from slow cooker to serving platter; sprinkle with cilantro and cashews.