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Ask a grown-up to switch the oven on to 180C/160C fan/ gas 4. Break the eggs into a small bowl and scoop out any bits of shell, then tip them into a large bowl.
Put the sugar and butter in a bowl, then sift over the flour, baking powder and cocoa.
Beat everything together using a wooden spoon or electric beaters, then stir in the chocolate drops.
Spoon half of the mixture into each tin and smooth the tops.
Ask a grown-up to bake the cakes for 20-25 mins or until risen and a skewer comes out clean. Cool in the tin for 5 mins, then turn out onto a rack.
Beat the butter and icing sugar, then fold in the chocolate. Spread over the middle, sandwich the cakes together, then dust with icing sugar.