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Its design allows air to circulate freely around the cookies so they bake and brown evenly. A jelly-roll pan (either 15 Â½ by 10 Â½ inches or 18 by 12 a.k.a. a half-sheet pan) has 1-inch-high sides and is perfect for making cake rolls; it can stand in for a cookie sheet in a pinch. It's also a terrific roasting pan for veggies and more.
If I were to follow a recipe calling for a 9 x 13-inch pan, but instead I decided to bake the batter in a half sheet pan, the half-sheet pan will bake the batter in less time than required by the 9 x 13-inch, because the half-sheet pan is both more shallow and has a greater surface area than the 9 x 13-inch pan.