In a bowl, whisk together soy sauce, honey, water, ketchup, garlic powder, and ground ginger.
Place chicken thighs in the bottom of a 4QT slow cooker. Pour the sauce overtop.
Cover and cook on LOW for 3-4 hours or 2-3 hours on HIGH, until chicken reaches 165℉.
Transfer chicken to a plate and cover to keep warm.
Whisk together cornstarch and 3 tablespoons of water and stir it into the sauce in the slow cooker. Cover and cook on HIGH for 20-30 minutes or until sauce is thickened. Add chicken back to the slow cooker.
Serve over rice with desired toppings.
Notes
Serve topped with sliced green onion or sesame seeds if desired.Leftovers will keep in an airtight container for 3 days and in the freezer for 1 month.