Jaffa cakes are no where near as tricky to make at home as you might think. The only fiddly bit is making the chocolate look perfect – but they're still great if you just spoon it over. For this recipe you will need a 5cm/2in round biscuit cutter, a 30x20cm/12x8in baking tray and a 12-hole shallow bun tin.
For the final technical challenge Mary Berry asked the bakers to make this simple sponge with homemade jam and buttercream – without a recipe. For this recipe you will need two 20cm/8in sandwich tins, an electric mixer and piping bag fitted with plain nozzle.