The first batch (left) that I baked on a regular sheet pan came out with nice crisp bottoms and pretty good tops. The second batch (right) was baked on an air bake pan and I didn't leave them in long enough so they got a little mangled when I took them off the parchment paper. The third batch (back) came out perfect - baked on an air bake pan a little longer than the second batch. A little bit of a crust to hold the shape that gives way easily to a melt-in-your-mouth center. Surprisingly, given the different baking conditions, all of them came out with with nice little "feet" as they rose in the oven.