Place the piadina inside a cake pan and press the edges firmly, shaping it with your hands.

Slice a banana and arrange the slices at the base of the cake.

In a separate bowl, mix the egg, yogurt, erythritol, blueberries, and, if desired, cinnamon. Transfer the mixture over the banana base.

Disporre qualche mirtillo tenuto da parte e infornare in friggitrice ad aria a 160 gradi per 30 minuti.

Once baked, let it cool before slicing and dust with powdered sugar or cocoa.