This document reviews and compares the top 5 cookie sheets. It discusses that cookie sheets made of aluminum conduct heat well for even baking but aluminum can warp at high temperatures. The best sheets have reinforced steel rims to prevent warping. The top sheets are made of aluminum or carbon steel with non-stick coatings, and have pros like even heating but also cons like some not being dishwasher safe. The review aims to help the reader choose the perfect cookie sheet for their needs.