Pre-heat oven to 180c/350F. Spray the donut pans on all sides to ensure easy removal.
Place the egg and sugar in a bowl. Mix well using a whisk.
Dissolve the coffee powder in a 1/4 cup of hot water.
Add the vanilla, oil, milk and dissolved coffee and mix well.
Add in the flour, baking powder, bicarb soda, salt.
Mix gently until all the ingredients just come together. Don't over mix the batter.
The batter will be runny, use a cup or jug to pour the batter into each donut hole. Fill till near the top
Place in the oven for 15-20 minutes until a toothpick removed comes out clean. Test this at the thickest part to ensure it's cooked all the way through.
Set aside to cool completely. Remove the donuts by gently twisting the donuts and pulling them off the centre.