Line a baking sheet with parchment paper. Blow up the balloons about halfway. Spray each balloon with baking spray. Drop 6, 1-inch circles of chocolate evenly on the prepared baking sheet. Dip a balloon in the melted chocolate and set on a prepared chocolate circle.
Add mousse, espresso beans and cocoa powder as desired. Once chocolate is set, pop the balloon and fill your chocolate cup with anything you like!