A baking sheet is a flat, rectangular metal tray used in the kitchen for baking various foods. It is typically made of aluminum or stainless steel and comes in different sizes. You can use a baking sheet to make cookies, roast vegetables, or bake pastries. Its smooth surface allows for even cooking and easy cleanup, especially when lined with parchment paper. Baking sheets often have a slight rim around the edges to prevent spills and keep food contained. They are an essential tool for any home baker or cook, making it easier to prepare delicious meals and treats. Whether you're using a cookie sheet or a jelly roll pan, a baking sheet is a versatile item in your kitchen.