Preheat the oven to 180°C (350°F) and grease two 20cm round cake tins.
Cream together the softened butter and sugar until light and fluffy.
Add the eggs one at a time, mixing well after each addition.
Stir in the vanilla extract.
Sift in the self-raising flour and baking powder, and fold gently.
Divide the batter evenly between the two prepared tins.
Bake for 25 minutes or until a skewer comes out clean.
Allow the cakes to cool in the tins for 10 minutes before transferring to a wire rack.
Spread jam on one layer and top with whipped cream.
Place the second layer on top and dust with icing sugar before serving.