Preheat oven to 350°F/ 160° C.
Whisk together the flour, cocoa powder, baking powder, baking soda, coffee powder and salt in a large bowl and set aside.
Mix Coffee in the milk and set aside.
In a medium bowl whisk egg with sugar until well combined.
Add milk, cream, melted butter, and whisk until combined.
Mix dry ingredients in wet ingredients in two batches.
Fill the batter ¾ way full using a piping bag.
Bake for 10 - 15 minutes or until a toothpick inserted into the center of the donuts comes out clean.
Allow to cool for 5 minutes in pan, then remove donuts from pan and transfer to a wire rack. Allow to cool completely before glazing.