Oscar the Grouch Cake (How To)

Ever wanted to make a Oscar the Grouch cake, I'll show you how! 2 Large Muffins (store bought) sponge cake. (double recipe for oscar) Ingredients (serves 6) 1/3 cup (50g) cornflour 1/3 cup (50g) plain flour 1/3 cup (50g) self-raising flour 4 x