- Crush the biscuits to a crumb and mix with the melted butter and 1 tbsp of the protein powder. Spoon into the bottom of 4 x 200ml glasses and chill whilst you make the chocolate mixture.
- Remove 8 of the segments of chocolate orange and set aside to decorate, then put the remaining segments into a bowl with the dark chocolate and milk. Set over a pan of barely simmering water and melt gently together.
- Once melted, allow to stand for 5 minutes to cool a little, then stir in the egg yolks and the remaining 1 tbsp of the protein powder.
- In a clean bowl, whisk the egg whites to medium-stiff peaks. Mix 1 spoonful of the egg white into the chocolate mixture to loosen, then gently fold in the rest of the egg whites, trying to keep as much air as possible.
- Divide the mousse mixture between the 4 glasses and chill for at least 3 hours before topping with the remaining chocolate orange segments and a scattering of orange zest.
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