We love sheet pans in the test kitchen. Technically they’re rimmed baking sheets, but you know what I’m talking about—the flat metal thing that goes in your oven.
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Add a wire cooling rack and you have the perfect vessel for roasting and broiling meats, holding breaded foods before and after frying, and drizzling chocolate over desserts. In a pinch, turn a sheet pan upside down and you have a pizza stone or a pizza peel.
But as essential as we think sheet pans are, there are a few ways they can get messed up.
First, have you ever heard that boinging noise after you place it in the hot oven?
That’s the pan warping, which is the metal expanding in a hot environment. Even a good pan can warp, but a sturdier pan will warp less, so the only way to avoid this is to buy the right pan. That’s one reason our winner from Nordic Ware beat out the seven other pans in our testing lineup.
The Best Rimmed Baking SheetsA rimmed baking sheet is essential for sheet cakes and handy for cookies. But if yours is flimsy or you use it only for baking, you’re not getting your money’s worth. Learn which baking sheet received our highest recommendation.
The second way pans get messed up: They change in color.
Sometimes they just get dull—they’re still lightly colored but aren’t as shiny as they were. This happens as the surface gets roughed up during use and cleaning.
Other times they darken or even turn black. This happens if you frequently roast things in oil. What’s happening is that oil polymerizes on the surface, like the seasoning of a cast-iron pan, and creates a layer.
Does It Matter That Your Sheet Pan Changed Color?
If your pan doesn’t look shiny and new anymore, is it actually bad? To find out, we made a bunch of different foods in shiny new pans, then in dull and darkened pans. Surprisingly, the dull and darkened pans actually browned better than the shiny new ones.
This is because darker colors absorb heat more efficiently than lighter colors. Think about how if you dress all in black on a 90-degree day, you’re going to be hotter than you would be if you were in a lighter color.
To make sure we weren’t imagining things, we put shiny new sheet pans and dull older ones in the oven with temperature trackers attached to record the rates at which they heated. Sure enough, the older sheets heated faster, hitting just over 400 degrees in 15 minutes. The shiny new sheets only reached 350 degrees in the same amount of time.
How To Roast EverythingThe first cookbook from America’s Test Kitchen devoted to the art and science of roasting, pulling together decades of test kitchen experience and knowledge to help you roast everything from meat and fish to vegetables and fruit.
Do You Need a New Sheet Pan?
If it’s constantly warping, yes, that’s a bad thing and you might just need to buy a new, sturdier pan. But if your pan’s getting dull or dark, it’s actually a good thing because you’ll be able to get even more delicious browning. That said, because dull and dark pans heat faster they might also run a bit faster, too, so you should check your food a little earlier than your recipe says to avoid overcooking.
Photo: Lena Mirisola/Getty Images