Pat chicken breasts dry and place in a zip top bag.
Put yogurt, roasted peppers, garlic,coriander seeds, and parsley in the bowl of a processor. Process until smooth.
Measure 1/2 cup of the mixture and pour it into the bag with the chicken. Marinate for at least 4 hours or as long as overnight.
Reserve the rest of the yogurt mixture for basting. It also makes a great veggie dip.
Preheat broiler. Spray broiler tray with non-stick cooking spray. Remove the chicken breast from the marinade and lay on the broiler tray. Top with a little more of the yogurt mixture, Broil 10 minutes. Turn chicken over and top with a little more of the yogurt. Broil 10 minutes more or until cooked through.