I'm going to making these for a coworker for her birthday. I've never made them. I'm torn between doing a strawberry filling or a filling with sliced strawberries peeking out (kinda a cookie--filling--sliced strawberries--filling -- cookie). Also considering doing a filling with the outside dusted with pink sugar crystals or mini chocolate chips. Anyone have experience with it and/or a good recipe? I'm planing on doing a chocolate cakes.