Preheat the oven to 350°F. Place 12 muffin liners in a muffin pan. Set aside.
In a mixing bowl, sift the flour. Mix in the baking powder, baking soda, cinnamon, pumpkin pie spice, and salt.
¾ teaspoon Baking powder, ¼ teaspoon Baking soda, 3 teaspoon Ground cinnamon, 2 teaspoon Pumpkin pie spice, ¼ teaspoon Salt
In a separate bowl, mix in the brown sugar, oil, eggs, vanilla, and pumpkin puree. Pour wet ingredients into the dry ingredients. Mix until combined.
1 cup Brown sugar, ½ cup Oil, 2 Large eggs, 1 teaspoon Pure vanilla extract, 1 ¼ cup Pumpkin puree
Fill the muffin liners ¾ full. Bake for 20-22 minutes. They are done baking when a toothpick inserted comes out clean.
Let the cupcakes sit in the pan for 10 minutes. Then, transfer to a cooling rack. Let them cool completely before decorating.