Preheat your oven to 180°C (350°F). Line a small baking tin with baking paper for easy removal.
Make the Dough:
In a mixing bowl, combine the sifted self-raising flour, protein powder, baking powder, and sweetener. Add the Greek yoghurt, vanilla extract, and melted butter. Mix until a soft dough forms.
Place the dough on a floured surface and roll it out into a rectangle.
Make the Filling:
In a small bowl, mix the dark brown sugar, cinnamon, and sugar-free maple syrup until combined. Spread the mixture evenly over the rolled-out dough.
Roll and Slice:
Roll the dough tightly from one end to the other to form a log. Slice into six equal rolls and place them on a lined baking tray.
Bake in the Oven:
Bake in the oven for 15-20 minutes, or until golden and cooked through.
Cool & Serve:
Allow to cool slightly before serving.