Preheat the oven to 350 degrees. Coat a muffin tin with cooking spray.
Combine the pumpkin and melted butter, then mix the eggs in one at a time. Mix well. Add the vanilla sugar, pumpkin pie spice and mix well.
Combine the flours with the baking powder, baking soda, and salt; mix well. Add the flour mixture to the pumpkin mixture until combined. Pour evenly into the prepared muffin tin.
Mix the sugar with the cinnamon together until well combined. Sprinkle over the tops of the unbaked muffins.
Place into the oven and bake for 25-30 minutes, or until cooked through.