Refrigerate bar cookies briefly after cooling to make the slicing easier.
Cookies can be frozen up to 6 months in the freezer if wrapped in aluminum foil or in a zipper lock plastic bag
To prevent cookies from darkening too much on the bottom, use shiny aluminum cookie sheets. Or double the pans, stacking the pan with the cookies on it on top of another cookies sheet. this slows down the process and results in more even baking. If you must use a dark baking sheet, reduce the oven temperature by 25 degrees
You really don’t need to grease the cookie sheet if following a recipe that’s high in butter. But if you feel it will prevent the cookies from sticking, go ahead and grease it lightly with solid shortening or vegetable oil spray. If