I've seen the article on collaring a round pan to make a taller cake, but I have never tried it. I was wondering if the same technique would work on a square pan. Has anyone tried it?

done it many times with my square pans and no problems here. I do make sure to add a flower nail for a better cooked center and more even baking due to you are changing the amount of batter you would normally use so you need to factor in more baking time too.

thanks. I wasn't sure how well it would hold the shape. I'll give it a try.

just make sure you keep your corners flush with pan so it doesn't round your corners.

i would think you could crease the corners on the collar too (it is just parchment paper, right?) and that would help the corners from rounding.

I make a sheet the same size height and length as the pan sides, so that they meet in the middle of the corners perfectly so they dont effect any thing that way.