Try this technique for lifting bar cookies out for baking pans.
Extracting bar cookies from baking pans can be tricky. Aluminum foil solves this problem, prevents sticking, and makes cleanup a breeze in recipes.
1. Fold an 18-inch length of foil lengthwise to an 8-inch width. Fit the foil into the length of a 13 by 9-inch baking pan, pushing it into the corners and up the sides of the pan; allow the excess to overhang the pan edges.
2. Cut a 14-inch length of foil and fit it into the width of the pan, perpendicular to the first sheet (if using extra-wide foil, fold the second sheet lengthwise to a 12-inch width). Spray with nonstick cooking spray.