Lay chicken thighs into the bottom of a 4-6 quart slow cooker.
Season with salt and pepper.
Add onion to the pot
Whisk soy sauce, BBQ sauce, brown sugar, honey, garlic, basil, oregano, ginger, and cornstarch together in a bowl; pour over the chicken.
Cook on High for 2.5 hours or Low for 6 hours.
Preheat broiler to high.
Remove chicken from slow cooker and place on a baking tray, skin side up, and broil for 3-4 minutes to crisp skin up.
Serve with sauce from slow cooker, over rice