Cut 4 (18x12-inch) sheets of heavy-duty foil. Spray foil with nonstick cooking spray. Spread 1/3 cup chicken mixture down center of each warm tortilla; roll up. Place 2 enchiladas, seam side down, on each sheet of sprayed foil. Drizzle each pair of roll-ups with about 1/4 cup enchilada sauce. Wrap each packet securely using double-fold seals, allowing room for heat expansion.