Preheat oven to 180°C, (160°C for fan ovens), Gas Mark 4.
Beat flour, condensed milk, egg, vanilla, buttery spread and baking powder until pale and fluffy.
Spoon mixture into 12 muffin cases. Bake for 15-18 minutes until springy and golden. Allow to cool.
Beat icing sugar, buttery spread and vanilla with enough condensed milk to make a smooth creamy icing. Spread onto cakes and top with sprinkles and decorations.
Recipe courtesy of Carnation