Season chicken breasts with a few pinches of salt and pepper. Heat a medium skillet over medium-high heat and add the olive oil. Cook chicken breasts for 3-4 minutes per side or until cooked through. Set aside to cool.In medium bowl, mix together the Greek yogurt, lemon juice, dijon, garlic powder, salt, and pepper until combined. Set aside.Once chicken is cool, cut into bite-size chunks. Place chicken in a large bowl and add Greek yogurt mixture. Stir to combine. Add nuts, celery, red onion, dried cherries, parsley, and dill and stir again to combine.Serve with crackers, on a sandwich, toast, or by itself!