Yummy Chocolate Celebration Cake

Heat oven Gas Mark 3 Cream butter & sugar together, until pale in colour. Add egg to above. Mix thoroughly. Add Vanilla to mix. Sift flour & Cocoa into the above and mix until combined. Spoon mixture into prepared tin.
Place in pre heated oven (Gas 3) for approx 45-50 mins. Depending on the oven. Check by inserting a tooth pick into the center. If it comes out clean then remove from oven and allow to cool completely.
When cake is cold, split in half and fill with some of the butter icing. Sandwich together and then coat the outside of the cake with the remaining butter icing. This does not have to be smooth. Press the chocolate sprinkles/shreads into the butter icing. If you are using it as a celebration cake you could add more decoration or candles to the cake.