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Heat the oven to 200C/180C fan/gas 6. Line a 12-hole muffin tin with muffin cases. Mix the flour, baking powder, cinnamon and both sugars together in a large bowl. Break up any lumps of brown sugar by rubbing them between your fingers.
Whisk the purée and eggs together in a jug, then add to the dry ingredients with the melted butter. Whisk for 1-2 mins with an electric hand whisk until just combined.
Bake for 15 mins until golden and risen and a skewer inserted comes out clean. Lift onto a wire rack to cool completely. Will keep for three days in an airtight container.