Brush chicken with olive oil and rub seasoning into chicken.
Roll up balls of foil and place in the bottom of the slow cooker with 2 thick slices of onion. Place chicken on foil, breast side up so it is slightly lifted off the bottom of the slow cooker. (You can use onion and carrot chunks instead if you prefer).
(Nutrition information provided is an estimate and will vary based on cooking methods and brands of ingredients used.)