Use a 10×15-inch jelly roll pan. If you don't have one, halve the recipe and use a 9×13-inch pan. Store the bars in the fridge but serve at room temperature. Refrigerate for 1 hour before slicing for the cleanest cuts. To make your own pumpkin pie spice, combine 1½ teaspoons cinnamon, ¼ teaspoon ground ginger, ¼ teaspoon ground nutmeg, a pinch of allspice, and a pinch of cloves. Freeze for up to 3 months, preferably before frosting, tightly covered with plastic wrap and foil. Thaw overnight, then frost before serving.
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