In a small bowl, whisk together the honey, soy sauce, and garlic until well combined.
Season the chicken pieces with salt and pepper on both sides according to your taste.
Place the chicken pieces in a single layer in a slow cooker. Try not to overlap them too much so they cook evenly.
Pour the honey garlic sauce over the chicken, making sure to coat them well with a spoon or a brush.
Cover the slow cooker with a lid and cook on low for 4-5 hours or on high for 2-3 hours, depending on how fast you want it done. The chicken is ready when it is cooked through and falls off the bone easily.
Transfer the chicken to a platter and keep warm. You can cover it with foil or a cloth to retain the heat.
Skim off any excess fat from the sauce in the slow cooker using a spoon or a ladle.
In a small bowl, whisk together the cornstarch and water until smooth.
Stir the cornstarch mixture into the sauce in the slow cooker and cook on high for 10-15 minutes, stirring occasionally, until slightly thickened.
Spoon the sauce over the chicken and sprinkle with chopped parsley if desired for some freshness and color. Serve your honey garlic chicken with rice, salad, or your favorite side dish and enjoy!