Place chicken in a 6-qt. electric pressure cooker. Combine broth, lime juice and chili powder; pour over chicken. Lock lid; close pressure-release valve. Adjust to pressure-cook on high for 6 minutes., Quick-release pressure. A thermometer inserted in chicken should read at least 165°. , Remove chicken. When cool enough to handle, shred meat with 2 forks; return to pressure cooker. Stir in lime zest. If desired, serve with cilantro.