Preheat the oven to 375°F. Line a muffin tin with baking cups and set aside.
In a large bowl mix all the wet ingredients and then combine the dry ingredients while stirring, except the blueberries.
Mix until well incorporated. Be careful not to overmix – a few lumps are fine. Now fold in blueberries.
Sprinkle with cinnamon and sugar.
Spoon into muffin tins, filling each cup about ¾ full. Bake for 20-25 minutes until the muffins are golden brown and the tops spring back to the touch.