Preheat oven 180ºC/350ºF.
Add the flour and Greek yogurt to a mixing bowl and stir until it forms a dough. If too wet, add a little extra flour just one tablespoon at a time. Empty onto a lightly floured work surface and knead gently. Roll into a rectangle roughly measuring 32 x 20cm.
Mix together the butter, cinnamon and maple syrup. If the butter is not soft enough, heat gently so it forms a paste, then spread it over the pastry. Tightly roll up the pastry from the 20cm side to form a log. Using a bread knife, cut into 14 even pieces, then place into a pie dish.
Brush with a little egg or milk wash, then bake for 25-30 minutes until golden brown then cool fully before frosting.
To make the frosting, mix together the mascarpone, icing sugar and clementine zest and juice, then spread over the top of the rolls and eat!