Pre-heat oven: 190oC / 170oC (fan) / Gas Mark 5 / 375oF
In a mixing bowl, beat the eggs, oil, sugar and milk together until fully combined.
In a separate bowl, sieve in the cocoa powder, flour and baking powder, then whisk together.
Gradually pour the wet ingredients into the dry, stirring together as you pour until just combined. There may be a few small lumps left, but that’s ok.
Slowly add in the hot coffee (fresh or instant), mixing as you pour until the liquid has only just combined.
Divide the mixture evenly between the cupcake cases in the muffin tin and bake for 15-20mins until risen and springy to the touch. Allow the cupcakes to cool on a wire rack while you make the buttercream.