While it may seem strange to do so, you can indeed use a cookie sheet on a grill. You have a couple of options. One is that the cookie sheet can act like a griddle the way it would on a stovetop. The second is to use your grill as an outdoor oven. The second option makes sense, as a grill is like an outdoor oven. Its characteristics are similar, and you can get similar results. Just pay close attention to the materials you use. Again, make sure that you keep the temperatures the cookie sheet is exposed to relatively low (around 350 degrees or less) to avoid damaging the cookie sheet. See your cookware manufacturer’s instructions for the details for your particular cookie sheet. Avoid glass or ceramic pans and opt for a solid metal baking sheet. Glass or ceramic could work if you kept the temperatures low, but it’s best not to risk a pan shattering in the grill. If you have one, a Baking Steel would be your best bet in this situation. It withstands high temperatures, making it ideal for the grill. So if your oven stops working or you prefer not to heat your whole house in summer by turning on the oven, give this tip a try.