1. I've specified 1 teaspoon of cinnamon as I feel this balances the flavour of the apple perfectly. Both flavours are delicate. If you want to add some extra kick you could add an extra 1/2 or full teaspoon of cinnamon, but you will lose some of the sweet apple flavour. 2. Some people like to grease both the tin and the baking parchment with oil. Greasing the baking parchment helps the icing sugar & cornflour to stick, but I prefer the consistency attained by not greasing the baking parchment. It's really up to you.