Place 1 disk between 2 lightly floured sheets of parchment paper; roll into 11x8-inch rectangle. Repeat with remaining dough, using 2 additional sheets of parchment paper. Place dough rectangles, with long sides together, on work surface. Discard top sheets of parchment paper. Spray 15x10x3/4-inch pan with cooking spray; invert over dough. Flip pan, holding pan and both pieces of dough together. Remove and discard parchment paper. Gently press dough onto bottom and up sides of pan, pinching seam together in centre to seal.