Combine chicken, salt, pepper, honey, soy sauce, onion, ketchup and garlic powder in a freezer bag.
Let all air out of bag. Seal tight and freeze.
When ready to prepare take it out of freezer and allow to thaw.
Dump entire bag of chicken and sauce into slow cooker. Cook on low for 3-4 hours.
When finished cooking take chicken out of slow cooker and leave the sauce.
Combine cornstarch with water, stir well.
Add it into slow cooker with sauce. Cook sauce on high until it begins to thicken (5-10 minutes).
Slice chicken into small chunks. Return to slow cooker and stir with sauce.
Serve over rice.