Preheat oven to 375F (190C) and line a tin with 10 paper liners. Set aside.
In a large mixing bowl, whisk together pumpkin puree, discard, melted butter, sugars, and pumpkin pie spice until thoroughly combined.
Add egg and vanilla extract and whisk well.
In a separate, medium-sized mixing bowl, whisk together flour, baking powder, baking soda, and salt.
Add dry ingredients to wet and use a spatula to gently fold together until just combined.
Evenly divide batter into prepared muffin tin.
Whisk together granulated sugar and cinnamon for topping and sprinkle evenly over prepared muffins.
Transfer muffins to center rack of 375F(190C) preheated oven and bake for 17-19 minutes, until a toothpick inserted in the center comes out clean or with a few moist crumbs.
Allow muffins to cool in the tin for 7 minutes before carefully removing to a cooling rack to cool completely.
