Place cupcake liners in muffin tin. Spray lightly with cooking spray.
Combine hot coffee and cocoa powder. Mix well to dissolve and set aside. By the time you mix this with the liquid ingredients, you'll have wanted it to cool to a lukewarm temperature so that it doesn't cook the eggs.
In bowl of stand mixer, combine flour, sugar, baking powder, baking soda, and salt with paddle attachment.
In a separate bowl, combine milk, oil, egg, and vanilla. Mix well to combine.
Add about half of the milk mixture to the flour and mix on medium high speed for 2-3 minutes until light and fluffy.
Combine the chocolate mixture with the remaining milk mixture and add to the batter. Mix with batter on medium speed for about 30 seconds, scraping sides of bowl before turning mixer on.
Distribute batter evenly to the 12 muffin cups. Batter will be very wet.
Bake in preheated 425 degree F oven for 5 minutes, then reduce heat to 325 F without opening the oven door. Continue cooking at lower temperature for an additional 13-15 minutes until a toothpick inserted in the middle comes out clean.
Remove from the oven and transfer cupcakes to a cooking rack as soon as they're cool enough to be touched.
Prepare buttercream frosting according to instructions or your other favorite frosting... or just devour it plain!
Recipe yields 1 dozen cupcakes and nutritional information is based on one unfrosted cupcake.
These cupcakes rise. A lot. If you're looking for flat cupcakes, this isn't the recipe for you.
This recipe can be made into a 9-inch round cake, however it will rise making the center taller than the edges which isn't always ideal for a cake recipe that you want to stack and frost.
The cocoa powder I use is Volupta Organic & Fair Trade Unsweetened Super Food Cacao Powder (I buy it at costco). If you use dutch processed cocoa powder, you're supposed to add 1/8 teaspoon of baking soda for every three Tablespoons of cocoa powder used because Dutch-processed cocoa powder is cocoa powder that has been washed in a potassium solution that neutralizes its acidity.