Mini Egg Butterfly Surprise Cakes

Ingredients

• 100g low-fat light margarine, e.g. Flora Extra Light (or call it ‘low-fat spread’)
• 100g soft brown sugar
• 2 medium free-range eggs, beaten
• 75g self-raising flour, sifted
• ½ tsp baking powder
• 25g cocoa powder
• 1 tbsp skimmed milk
• 12 Mini Eggs
• 50g butter, softened
• 75g icing sugar plus extra for dusting
• 1 tbsp cocoa powder
• a few drops vanilla extract
• 1 tsp skimmed milk