53 Pa. Stat. § 10201
The governing body of any municipality shall have the power to create or abolish, by ordinance, a planning commission or planning department, or both. An ordinance which creates both a planning commission and a planning department shall specify which of the powers and duties conferred on planning agencies by this act; each shall exercise and may confer upon each additional powers, duties and advisory functions not inconsistent with this act. In lieu of a planning commission or planning department, the governing body may elect to assign the powers and duties conferred by this act upon a planning committee comprised of members appointed from the governing body. The engineer for the municipality, or an engineer appointed by the governing body, shall serve the planning agency as engineering advisor. The solicitor for the municipality, or an attorney appointed by the governing body, shall serve the planning agency as legal advisor.
53 P.S. § 10201