Get prepped: Preheat your oven to 160°C fan/180°C/350°F/Gas Mark 4. Put 12 cupcake cases into your tin.
Cream the butter: Cream your room temperature butter with your sugar until it's pale, light and fluffy, using a wooden spoon or an electric hand whisk.
Create the batter: Add all of the eggs, along with the milk, and sift in the flour and cocoa powder and mix together until everything is well combined.
Spoon into cases: Spoon equal amounts of mixture into your cupcake cases. (I use an ice cream scoop as this gives the perfect amount and ensures some uniformity.)
Time to bake: Bake for about 15-18 minutes until the cakes are golden and slightly bouncy to the touch. Then leave them to cool on a cooling rack.
Now make the buttercream icing: Beat your butter until it's pale, light and fluffy then beat in the icing sugar. Mix the cocoa powder with 1-2 tbsp boiling water, just enough to make a thick smooth paste. Then mix this into the butter and icing sugar. You want your icing to be most soft, fluffy and pipeable so add a teaspoon of boiling water at a time until it's the texture that you want.
Cool and decorate: Once the cakes are cooled, pipe or spoon on the icing, and place 3 Mini Eggs on top of each.
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