Pre-heat oven to 220 degrees celsius (fan-forced).
Prepare cupcake tins by lining with (14) patty pans.
Sift flour into large mixing bowl. Add sugar and stir to combine.
Add remaining ingredients, apart from a handful of blueberries (to decorate top of muffins) and the rapadura sugar, and stir gently to combine. Don't over-stir.
Spoon mixture into patty pans. Add a couple of blueberries to the top of each muffin and sprinkle with sugar.
Cook for 5 minutes before turning oven temperature down to 190 degrees celsius (fan-forced). Bake for a further 14 minutes (or until a metal skewer inserted into a muffin comes out clean).
Remove from oven and allow to cool for a few minutes before easing each muffin from the tin and placing on a cooling rack.