The lesson learned is NEVER use the large metal bar pan to make Ham & Cheese Brunch Squares! Last Saturday, I had a huge brunch party (25 expected - 24 showed up!) and the host had several vegetarian guests, so we decided to do one batch in the stone, and a vegetarian one in the metal bar pan. Well, it stuck so bad (and yes, I oiled the pan) that since then, I've been soaking, scraping, and scrubbing every day! Finally, today I bought a metal scrubbie thing, and was able to make it presentable again. Of course, it's completely covered in scratch marks now, but at least it's clean. I guess I've used stoneware for so long that I forgot what a pain metal bakeware can be!