Mary Berry's vanilla cupcakes with swirly icing recipe

Ingredients

• 175 g butter (room temperature), cut into large pieces
• 175 g self-raising flour
• 175 g caster sugar
• 1/2 tsp baking powder
• 3 large eggs
• 1/2 tsp vanilla extract
• 6.2 oz butter (room temperature), cut into large pieces
• 6.2 oz self-raising flour
• 6.2 oz caster sugar
• 2 –3 tbsp milk
• 350 g icing sugar, sifted
• 1 –3 drops pink edible colouring
• 12.3 oz icing sugar, sifted
• 1 cup edible pink hearts or other sprinkles