Preheat the oven to 180°C. Line a muffin tin with paper cases or place 12 silicon muffin cups onto a baking tray.
In a large mixing bowl combine flour, baking powder and cinnamon, if used.
Zest one of the mandarins, then put all 3 into a blender (with the skin) and whizz until smooth. Add the eggs, oil, maple syrup and sugar, then process again for a minute or so.
Add this mixture to the flour and mix until you get a smooth batter. Don’t overmix!
Fold in the almonds.
Spoon the batter into the muffin tin or silicon cups, then bake in the oven for about 25 minutes until golden.
Let them cool in the tin or cups, then brush them with maple syrup or honey and scatter the mandarin zest on top.