Nerdy Tips The secret to juicy grilled chicken? marinate, marinate, marinate and baste with the leftover marinade while grilling. Pounding out the chicken breasts before marinating will even out the meat so that the thinner part isn’t overcooked before the thicker part is done. If you opt for bone in, the chicken will take longer to grill. If you are using leftovers of the grilled chicken to make tacos, reheat the chicken by steaming to keep it moist. You can do this by putting sliced chicken in a pan with a splash of water (or even better, chicken stock) over medium heat while covered for 3-4 minutes.