Always read labels to make sure each recipe ingredient is gluten free. Products and ingredient sources can change.
For easy removal and cutting, line the pan with foil, leaving 1 inch of foil overhanging at 2 opposite sides of pan; spray as directed. When cooled, use the foil to lift the bars out of the pan and place on a cutting board.
When using cooking spray, make sure it is gluten free. Some cooking sprays are for baking and contain flour.