1. Place the flour, protein or milk powder and psyllium in a bowl.
2. Mix well, integrating the ingredients.
3. Add the egg, Egg whitess, butter and sweetener.
4. Mix everything together.
5. On a baking tray, place baking paper.
6. divide half of the mixture into 2 parts.
7. Add the chocolate on top as a filling.
8. Add the rest of the mixture by covering the filling on each piece.
9. Bake for 2 minutes at 200°C/390ºF top and bottom.