"Using a warped one is among the worst mistakes you can use with a sheet pan: If the nice, flat pan becomes raised in some places, that's exactly where food will cook or bake unevenly."
"When you notice your sheet isn't lying flat anymore, place the pan in your oven at around 200 degrees Fahrenheit. After about 10 minutes, take it out and lay it on an even, flat surface."
"The biggest reason baking sheets warp is sudden temperature changes. Popping a room-temperature pan into a blazing hot oven instead of letting it heat up gradually can cause warping."
Sheet pans are durable kitchen essentials that can warp over time. A warped pan causes uneven cooking. To fix a warped sheet pan, heat it in the oven, then pound it flat on a surface. If necessary, use a wooden block for added impact. Prevent warping by avoiding sudden temperature changes, such as placing a cold pan in a hot oven or exposing a hot pan to cold water.
Read at Tasting Table
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