Preheat oven to 200deg;C. Lightly grease a 12–hole, 1/3-cup muffin pan
or line it with paper patty cases.
Place flour in a bowl and add sugar, baking powder and cinnamon. Add sultanas. Whisk together egg, buttermilk and oil and fold into dry ingredients, until just combined.
Spoon mixture into prepared pan.
Dust well with combined sugar and ground cinnamon. Bake for 15-20 minutes, until golden and cooked when tested with a skewer. Cool on a wire rack before packing into lunch boxes.