Place all the ingredients except the chicken breasts into a small food processor and process until it’s a pesto like consistency. You should have 1/2 cup pesto/sauce.

Measure out 1/4 cup, cover and place it in the refrigerator to reserve it until the end of the cooking time.

Pour the remaining 1/4 cup over the chicken breasts and toss to fully coat each chicken breast. Cover and place the chicken breasts into the refrigerator to marinate for 1 hour.

When the chicken has finished marinating, remove the reserved sauce from the refrigerator and let it start to come to room temperature.

Preheat the grill over medium heat until it reaches a steady temperature of 350º-400ºF.

Place the chicken on the grill and grill for about 8 minutes per side or until no longer pink in the center.

Remove the chicken from the grill and brush the reserved sauce over the top and serve immediately.