Thanks, inedible- I tried the cornstarch with a couple of small eggs, and it worked perfectly! I just poured about 1/2 inch of cornstarch in a small condiment bowl, then gently nestled the end of the egg into it just far enough to hold it upright. After baking, it came right off with water and a toothbrush and left no marks that I could see. It seems like the cornstarch can be reused too, which is nice. I'll update again once I try it with large eggs, but I'm sure it will work well with them too- or better than crumpled tissues or polyfill, at least. :)