Preheat the oven to 350 degrees and line a 12-count muffin pan with cupcake liners.
Chocolate Cupcakes
In a medium-sized bowl, whisk together the flour, sugar, black cocoa powder, pumpkin spice, baking soda, baking powder, and salt.
In a large bowl, whisk together the egg, milk, water, oil, and vanilla extract. Add the flour mixture to the wet ingredients and whisk until combined.
Fill the cupcake liners½ way full (about 2 tablespoons) and bake for 15-20 minutes, or until a toothpick inserted into the middle of the cupcake comes out clean. Allow them to cool in the pan for 10 minutes and then transfer them to a wire rack to finish cooling.
Pumpkin Frosting
In the bowl of an electric stand mixer using the paddle attachment, beat the butter on high speed until light and creamy (1-2 minutes).
Add the powdered sugar, pumpkin puree, pumpkin spice, cinnamon, and vanilla extract and mix on low speed for 30 seconds. Then increase the speed to high and mix for another 1-2 minutes until smooth and creamy.
Frost the cooled cupcakes. I placed the pumpkin frosting in a piping bag and used the Wilton 1M piping tip.
Store any leftover cupcakes in an airtight container at room temperature for up to 2 days or in the refrigerator for up to 5 days.
Video
Notes
Measuring Flour: To help ensure you don’t add extra flour, follow these three simple steps: 1) Fluff up the flour using a fork. 2) Spoon the flour into your measuring cup. 3) Scrape a knife across the top of the measuring cup to level out the flour.
Cupcake Batter: Evenly divide the batter amongst the cupcake liners, only filling them ½ way full (a little more than 2 tablespoons).
Frosting: Frost the cupcakes once they have completely cooled. I used a piping bag and the Wilton 1M tip to frost these cupcakes.
Pumpkin Spice: If you do not have pumpkin pie spice at home, you can easily make your own. Here is my recipe for how to make your own pumpkin spice.