Pre-heat the over to 180 degrees/Fan 160 degrees/Gas 4. Put muffin cases into a 12-hole muffin tin.
Measure your butter and sugar into the bowl and cream together until fully incorporated. Add each egg and mix until both are combined.
Sieve your flour and baking powder in to the bowl and then mix until fully incorporated then add the vanilla extract and milk until mixed in
Melt some milk chocolate in the microwave then pour into the cake mixture and mix until fully incorporated.
Crush up 5 bourbon creams then mix until the cake mixture. Fill each cupcake case until about ¾ full then place in the oven to cook for 20 minutes.
Once cooked, remove from the oven and leave to cool in the tin for a minute on a cooling rack then remove from the tin and place on cooling rack until fully cooled