- Preheat oven to 180°C/350°F and line 2 cupcake pans with 14 papers 
- Sift flour, cocoa, baking soda, baking powder and salt and set aside 
- In the bowl of a stand mixer, beat the eggs, sugar and vanilla on medium-high speed for 10 minutes, stopping and scraping the bowl as needed. 
- Now add the sour cream and mix on low until combined 
- Stop the mixer and add half of the flour mixture, mixing on low until just combined. 
- With the mixer on low, slowly add half of the coffee 
- Repeat the flour and coffee additions, then mix until just combined 
- Use an ice cream scoop to scoop the mixture into the cupcake papers 
- Bake 1 tray at a time for 20 minutes 
- Remove from oven and cool the cupcakes on a cooling rack.  
- Once cooled, twist an apple corer into the centre of each cupcake, and remove the core (you're going to just eat that!).  No corer?  A pairing knife will work fine.