To keep food from sticking to your grill, you need to make sure you scrub off any baked-on food that might still be on your grill grates or your chicken is just going to stick to that blackened char. Don't have a grill brush? Just preheat your gas grill to high for a few minutes and close the lid. Open it up, turn down the heat, and scrub grates with a wad of aluminum foil. Works for me every time!