Those of you who say you have stainless cookie sheets - are you *sure* they are stainless and not aluminum? I ask because a couple of years ago I was on a mission to find some stainless cookie sheets and muffin tins and no one in the entire Seattle area carried them - not the regular stores, the fancy stores or the restaurant supply stores. Just aluminum. Sometime nice heavy duty half sheet pans, but still, aluminum. The only place I have found them is online, and they aren't all that inexpensive. So what kind of store did you purchase them in if you have them? I'm not trying to be argumentative, please don't get me wrong, just very curious and I admit, a bit skeptical, since Seattle is a major city, known for being green and I haven't been able to find them around here.
I decided to go with cast iron muffin pans (love them!) and my baking dishes are a combo of glass, ceramic and cast iron. I have a stoneware mini loaf pan and pizza stone and love both of those, so I'll probably get a regular loaf pan and large baking dish when I can. For cookie sheets, I have reluctantly settled for aluminum for now, and I use parchment paper or a silicone mat to line them (silicone is not plastic by the way, not that I suggest baking in it - but that is for texture reasons....the mat works well for things like cookies though, and I'd rather my food touch it than the aluminum). I do my best to avoid plastic in the kitchen.