Why do my baking sheets warp in the oven?

Warping happens when thin metal expands unevenly from temperature differences across the surface. Heating up too quickly, using thin pans, and placing room-temperature pans in hot ovens all cause warping. Solution: buy heavy-gauge pans (16-18 gauge) and preheat pans with the oven. Nordic Ware and Vollrath pans are virtually warp-proof.

Should I use parchment paper or a silicone mat?

Parchment paper is best for cookies (crisper bottoms), roasting (easy cleanup), and baking (prevents sticking). Silicone mats are reusable, eco-friendly, and best for macarons and even heat distribution. Parchment is disposable but more versatile. Most bakers use both — parchment for daily use and silicone mats for specific tasks.

Best Baking Sheets 2026