If you've ever made popovers, this recipe will probably look familiar. It's almost the same batter, only this one has vanilla and some sugar added to make it taste more like a puffy pancake. Also, instead of making individual puffs, like popovers, you bake this batter in one big pan and then cut into squares. Use a large bowl for this so you can have fun and really let loose with the mixing without worrying about the batter flying out of the bowl and landing on the ceiling.