Preheat the oven to 180℃ fan/200℃/Gas Mark 6. Add cupcake cases into your 12-hole muffin tin.
Mix all the cake batter ingredients together in a bowl until smooth (use an electric whisk if you have one). Spoon the mixture evenly between each cupcake case until it's all used up.
Bake for 16-18 minutes at the top shelf of the oven until evenly cooked and there's no wet mixture left.
Leave the cakes to cool for 5-10 minutes, then carefully bring them out of the tin. Leave them to cool on a wire rack if you have one.
Make the icing by mixing the ingredients together until they form a thick smooth paste. When the cakes are completely cooled, spoon over the icing and add sprinkles.
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