Peel, core, and dice the apples. Cook them with the apple juice in a saucepan over medium heat for 8-10 minutes until soft. Allow to cool for 10 minutes.
In a freezer bag, crumble the biscuits and mix with the cocoa powder by shaking. In a separate bowl, stir the yogurt with the vanilla sugar and sugar until smooth.
Layer the biscuit mixture alternately with the apple compote and yogurt mixture in 4 tall glasses. Dust the top of each glass with cocoa powder.