Cut a parchment paper of the tin size using scissors and grease the cake tin with oil on the base and sides. Place the butter paper cut-out over it.
Yes, fresh chopped fruits can be used in cakes for layering. Just the shelf life of the cake decreases when fresh fruits are used.
The commonly used spices in cakes are - Cinnamon, nutmeg, cardamom.
Over-ripe bananas are used in cake batters, whereas for caramelizing and for toppings, normal ripened bananas are used.
Cover it completely with a cling wrap and store it in an air tight container or in a zip lock bag.