Spray 12 muffin pan cups with cooking spray. Place 1 phyllo sheet on work surface; spray lightly with cooking spray. Top with 5 of the remaining phyllo sheets, spraying each phyllo sheet with additional cooking spray before stacking as directed. Cut into 6 squares with sharp knife. Lightly press each layered square into prepared muffin cup. Repeat with remaining phyllo sheets to fill remaining prepared muffin cups.