Blackberry cupcakes (makes 12 muffin size cakes)Ingredients125g (4.5 ounces) butter, softened1/2 teaspoon (1/6 ounces) vanilla extract150g (5.2 ounces) caster sugar2 eggs150g (5.2 ounces) self-raising flour150g (5.2 ounces) blended blackberries60ml (2...