Simplifying Grants Act of 2023 This bill sets forth procedures for simplifying the grant process for nonurbanized areas, for both existing and new grant programs. Each agency must make publicly available a checklist for covered local governments with respect to each grant program of the agency for which such governments are otherwise eligible that includes each requirement for every step of the grant process. The Office of Management and Budget must report to Congress (1) within 270 days of this bill's enactment, evaluating the extent to which agencies have simplified the requirements and made the checklist available; and (2) each April 1st, evaluating the amount of technical assistance provided and the amount of funds awarded.