Whether you’re roasting vegetables, preparing a sheet pan dinner, toasting nuts, or baking focaccia, a good-quality rimmed baking sheet is an indispensable kitchen tool. And while many of them look alike, the best rimmed baking sheets are made of a durable aluminum that ensures even browning and will fit comfortably in your oven.
For most ovens, a baking sheet measuring 12 to 13 inches wide by 17 to 18 inches long is the best size. This is sometimes referred to as a half sheet pan. If your baking sheet has ever warped or bent when placed in a hot oven, this is due to thin, flimsy construction. That's why I recommend looking for a durable, weighty baking sheet, ideally made from aluminum. Aluminum conducts heat well for even browning, and it's an affordable choice for cookware. While you can find some options with nonstick surfaces, this is a matter of preference. Parchment paper turns any baking sheet into a nonstick surface that’s easy to clean, and some cooks like the flavor that comes from the crusty bits that develop on uncoated aluminum baking sheets.
When you can, opt for a baking sheet with a thick, rolled edge that’s reinforced with a stainless steel core. The edge keeps ingredients contained and prevents buckling or warping under temperature changes, which can lead to uneven baking and burning.