Preheat oven to 160 °C . Line muffin tin with paper liners.
In the bowl of your stand mixer or a large mixing bowl, sift together cocoa powder, sugar, flour, baking soda, baking powder and salt.,
In a measuring jug or bowl combine eggs, oil, milk, sour cream, and vanilla extract. Add wet ingredients to flour mixer and beat on medium speed until smooth and incorporated. Stir in hot coffee.
Fill each liner ⅔ full and Bake for 20 or until a toothpick inserted in the centre comes out clean. Let cupcakes cool in pan for 5 minutes before removing to cooling rack to cool completely.