Preheat the oven to 350°F, grease the cupcake tins and place the cupcake liners.
In the bowl of a stand mixer fitted with the paddle attachment, combine the sugar, flour, cocoa, baking soda and baking powder. Mix on low until dry ingredients are thoroughly combined.
On low speed, add eggs, buttermilk, coffee, oil and vanilla.
Once everything is combined, beat on medium speed for 1 minute.
Pour batter into cupcake liners 2/3 full.
Bake for about 20 minutes, or until wooden toothpick inserted in center comes out clean.
Transfer pans to wire rack and let cool completely.