On a sheet of parchment paper, lay out the 2 sheets of puff pastry slightly overlapping about 1/2-inch to form a 16 x 9-inch rectangle (cut off any excess pastry). Press the overlapped seam together with a fork. With a sharp knife, score pastry about 1/2-inch in from edges. With any excess pastry that is left over, cut into thin strips & place around the outside edge to help form a ‘lip’.