Use this large sponge cake recipe as the base for a kids’ party cake. It’s a jam-filled sponge coated with buttercream, ready for you to cover with fondant icing and decorate in any way you like.

Don't substitute self-raising flour for other types such as strong bread flour or your cake will be flat as a pancake. During baking, as the air bubbles inside the batter expand and the sponge ...