Baking sheet also known to some as a cookie sheet also know to some as a baking pan.
Whatever you call it, a baking sheet does everything from bake cookies to sheet pan dinners to free-form bread to homemade crackers and even freezing fruit. You need at least 1 in your kitchen.
Luckily, baking sheets are easy to store and easy to stack. Look for easy sizes to fit in the dishwasher, non-stick, and oven-safe.
The most commonly used sheet size for baking cookies is the 12 by 17 inch.
I recommend Calphalon Baking Sheets...they go in the dishwasher and can handle up to 500degrees in the oven.
NOTE: most baking sheets can't handle the temps of the broiler.