Place the ingredients to make the pesto sauce in the blender or food processor and blend until semi-smooth. If you buy it, scoop out the sauce into a zip bag.
Place the pesto sauce and chicken in a large zip bag and seal to close.
Marinate the chicken in the refrigerator for one hour up to overnight.
When ready to cook, remove the zip bag from the fridge and cook the chicken in your preferred method.
Discard any excess pesto left in the bag.
Notes
You can make pesto without pine nuts by swapping them with almonds, sunflower seeds, pumpkin seeds, and more. If using store-bought pesto sauce use ½ cup.