01 -
Preheat the oven to 350°F and line a standard cupcake pan with 12 liners.
02 -
Beat softened butter and granulated sugar with an electric mixer for 1 to 2 minutes until pale and fluffy.
03 -
Add the whole egg, egg yolk, and vanilla extract to the butter mixture and blend for 1 minute until smooth and pale.
04 -
Mix in whole milk, sour cream, and canned pumpkin puree until evenly combined.
05 -
In a separate bowl, whisk together sifted flour, black cocoa powder, pumpkin pie spice, baking powder, baking soda, and salt.
06 -
Gradually add the dry mix to the wet ingredients and stir until the batter is smooth.
07 -
Distribute the batter evenly into the prepared liners, filling each about three-quarters full.
08 -
Bake for 17 to 19 minutes or until a toothpick inserted into the center comes out clean.
09 -
Allow cupcakes to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.
10 -
Measure 1/2 cup canned pumpkin puree onto a plate and blot with paper towels to remove excess moisture until it measures 1/4 cup; set aside.
11 -
Using an electric mixer, beat the softened butter on high speed until pale and fluffy, approximately 5 to 10 minutes.
12 -
Add cold cream cheese to the butter and mix until fully incorporated.
13 -
Mix in the dried pumpkin puree and pumpkin pie spice until evenly distributed.
14 -
Gradually add powdered sugar, one cup at a time, mixing until the frosting is light and fluffy, about 1 to 2 minutes.
15 -
Once cupcakes have cooled completely, pipe a generous amount of frosting onto each using a piping bag fitted with a decorative tip.
16 -
Serve immediately or store leftovers in an airtight container in the refrigerator for up to three days.