Preheat the oven to 180°C (350°F).
In a medium bowl, combine the flour, protein powder, baking powder, and granulated sweetener.
Add the yogurt, mashed banana, and vanilla extract to the dry ingredients. Mix well until a dough forms.
Once the dough is well combined, knead it for 1-3 minutes to develop the gluten.
Cover the dough and let it rest for 5-10 minutes to allow it to relax.
Roll out the dough into a large rectangle on a lightly floured surface. Aim for a thickness of about 1/4 inch.
In a small bowl, mix together the light butter, granulated sweetener, and cinnamon to create the filling. Spread the cinnamon sugar filling evenly over the rolled-out dough.
Cut the dough into 7-8 strips vertically. Roll up each strip tightly to form cinnamon rolls. Slightly flatten each roll with your hands or a spatula
Place the cinnamon rolls in a greased baking dish or on a lined baking sheet. Bake in the preheated oven for 22-25 minutes, or until the rolls are golden brown and cooked through.
In a bowl, mix together the peanut butter powder, icing sugar, and milk until smooth and creamy. Adjust the milk quantity for desired consistency.
Once the cinnamon rolls are done, remove them from the oven and let them cool for a few minutes. Drizzle the peanut butter mixture over the cinnamon rolls. Optionally, sprinkle with chopped peanuts for added texture.
Allow the rolls to cool for an additional 5-10 minutes, then serve and enjoy!