Make the sauce: In a bowl, whisk together honey, soy sauce, chicken broth, minced garlic, rice vinegar, sesame oil, ginger, and red pepper flakes.
Prep the chicken: Trim excess fat and pat the chicken dry. This helps the sauce cling better and keeps the texture clean.
Layer in the slow cooker: Place the chicken in a single layer in the slow cooker.
Pour the sauce over the top, making sure all pieces are coated.
Cook low and slow: Cover and cook on Low for 4–5 hours or High for 2.5–3 hours, until the chicken is tender and reaches 165°F.
Thicken the sauce: Remove the chicken to a plate. Whisk cornstarch with cold water to make a slurry. Stir it into the hot cooking liquid, cover, and cook on High for 10–15 minutes until glossy and slightly thickened.
Finish and serve: Return the chicken to the slow cooker, toss gently in the sauce, and let it sit for 5 minutes.
Garnish with sesame seeds and green onions.
Plate it up: Spoon over rice, noodles, or steamed broccoli for a complete meal.