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Pre-heat the oven to 175°C (350°F) and prepare a muffin tray with cake cases.
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Beat the sugar and butter together until soft and fluffy. Add the egg and continue to beat until the mixture is nice and light.
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Combine the dry ingredients and then add to the wet, mixing well.
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Start off by adding 120ml of milk and add more if required. Finally, stir in the chocolate chips/pieces.
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Pour the cake batter into the cupcake cases and bake for around 17-20 minutes, until an inserted skewer comes out clean. Remove from the oven and allow to cool completely on a wire rack.
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For the frosting: beat the icing sugar and butter together until light and soft. Add the food colouring (if using) and mint essence/extract. If the mixture is a little stiff, add just a touch of milk to loosen it. Stir in the retained chocolate chips just until they are equally distributed.
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Make sure that the cupcakes are completely cold before frosting as this will make it easier to cut them (they are soft and quite fragile). Cut each one in half and slather on a good layer of frosting. Place the top back on and sprinkle with a touch of icing sugar. Enjoy!