I keep a small rimmed sheet pan — nonwarping — in my oven, not for want of storage elsewhere, but because I frequently use it and like to have it ready. A new heavy-duty aluminum pan from Chicago Metallic has wire-wrapped rims to resist warping and textured surfaces to aid in food release. The sheet pans come in three sizes, 9-by-13 inches, 10-by-15 and 8-by-13, $11.99 to $16.99. The line also includes loaf, cake, pie and pizza pans.
Chicago Metallic textured aluminum sheet pans, chicagometallicbakeware.com.