Preheat oven to 375 degrees. Line 12-cup muffin tin with paper liners and spray with baking spray.
Add flour, sugar, coca, baking soda and salt to bowl and blend
Add eggs, buttermilk, butter and vanilla to a standing mixer, and blend, add flour mixture slowly.
Add coffee and blend, batter will be very runny.
Using a measuring cup add batter to muffin tins till ? full.
Bake for 22-25 minutes, or until cake tester comes out clean.
Remove and let tin cool on rack for at least one hour or until completely cool.
Remove cupcakes from tin before frosting.