Heat the oven to 180ºc/160ºc fan and line three 20cm/8inch cake tins with baking parchment, leave to the side.
Dissolve the 4tsp strong espresso/instant coffee in 1tbsp of boiling water and leave to the side to cool fully.
Beat together the unsalted butter and caster sugar until light and fluffy.
Add in the self raising flour, eggs and baking powder and beat again briefly until combined - try not to overbeat!
Fold through the cooled dissolved coffee in to the cake mix so it's evenly distributed.
Divide the mixture equally between the tins and smooth it over.
Bake for 35-40 minutes, until a skewer comes out clean
Once baked, leave the cake to cool in the tin for 10 minutes, and then remove and leave to cool fully on a wire rack.
Coffee Buttercream Frosting
Dissolve the 3tsp strong espresso/instant coffee in 1tbsp of boiling water carefully, and leave to cool fully.
Beat the unsalted butter on it's own until smooth
Add the icing sugar and mix
Add the coffee and mix again until light and fluffy
With the first layer of the cake, spread/pipe half of the buttercream onto the top of the first layer, then add the second cake on top, and repeat again
Sprinkle over some pretty sprinkles and or chocolate coated coffee beans and enjoy!
Notes
This cake will last in a container for 3+ days at room temperature, or you can freeze for up to 3 months!