Any applicant for or recipient of adoption assistance aggrieved by any decision of a local board or licensed child-placing agency in granting, denying, changing or discontinuing adoption assistance, may, within 30 days after receiving written notice of such decision, appeal therefrom to the Commissioner. Any applicant or recipient aggrieved by the failure of the local board or licensed child-placing agency to make a decision within a reasonable time may ask for review by the Commissioner. The Commissioner may delegate the duty and authority to duly qualified hearing officers to consider and make determinations on any appeal or review. The Commissioner shall provide an opportunity for a hearing, reasonable notice of which shall be given in writing to the applicant or recipient and to the proper local board in such manner and form as the Commissioner may prescribe. The Commissioner may make or cause to be made an investigation of the facts. The Commissioner shall give fair and impartial consideration to the testimony of witnesses, or other evidence produced at the hearing, reports of investigation of the local board and local director or licensed child-placing agency or of investigations made or caused to be made by the Commissioner, or any facts that the Commissioner may deem proper to enable him to decide fairly the appeal or review. The decision of the Commissioner shall be binding and considered a final agency action for purposes of judicial review of such action pursuant to the provisions of the Administrative Process Act (§ 2.2-4000 et seq.).