Mix margarine, sugar, eggs and vanilla together. Add flour, baking powder and salt. Pat half the dough mix in greased 9x13" pan, spread can of pie filling over this. Pat rest of dough on top. Bake at 350 degrees for 40 minutes.
While warm frost with glaze made from powdered sugar, milk, margarine and vanilla.
From: Glorious Grub Cookbook By. Joan Stewart