Preheat oven to 375. Line a standard muffin tin with liners.
In a large bowl, whisk flours with brown sugar, ginger, baking soda, cinnamon, salt and cloves.
In a separate large bowl, whisk buttermilk with molasses, oil and egg.
Mix dry ingredients into wet ingredients until incorporated, being careful not to over mix the batter.
Scoop into 10 lined muffin cups and sprinkle evenly with sugar (if using).
Bake for 18-20 minutes or until a toothpick inserted in the centre comes out dry.