Prep the chicken: Remove the chicken out of the fridge 20-30 minutes before cooking. Pat dry with a paper towel and sprinkle with salt and pepper. Let it sit at room temperature.
Gather the ingredients: Meanwhile, gather the other ingredients. In a cast-iron skillet or heavy-bottom pan, heat oil over medium-high heat. Sear the chicken, skin side down, until golden brown. Transfer the chicken to the crockpot, skin side up.
Make the sauce: In a medium bowl, whisk together ketchup, soy sauce, honey, garlic, onion powder, dried green onion or chives, and ground ginger. Then pour the sauce mixture over the chicken.
Cook the chicken: Lock the lid and cook on HIGH for 3 hours or LOW for 5 hours, or until the chicken thighs are tender and the sauce has thickened.
Serve: Remove chicken from the slow cooker and place on a serving plate. Spoon the sauce over, and sprinkle with toasted sesame seed and chopped fresh green onions. Serve over rice or noodles, or with steamed veggies!
