Preheat the oven to 180°C/350°F/Gas mark 4. Line
a 12-hole shallow muffin
tin with paper cases.
Put the butter, sugar,
flour, milk, vanilla essence and eggs
in
a bowl and beat with an electric beater on a low
speed for 2 minutes, or until
well mixed.
Increase the speed and beat for
another 2 minutes, or until smooth and pale.
Divide the mixture evenly among the cases and
bake for 20 minutes, or until
cooked and golden. Transfer to a wire rack to
cool completely.
Using a small sharp knife, cut shallow rounds
from the top of each cake. Cut
these in half.
Spoon 1/2
tablespoon cream into the hole in each cake,
then top with a teaspoon of jam.
Position two
halves of the cake tops in the jam to resemble
butterfly wings. Dust the cakes with icing sugar
before serving.