Preheat your oven to 180°C. Well oil one large or 10 single serve ring tins or 8 medium muffins tin. A light sprinkle of flour will help reduce sticking.
Combine your dry ingredients; paleo flour, cinnamon, baking powder, bi-carb soda and salt, until well mixed.
Beat together the banana, nut butter, eggs, oil and vanilla in a cake mixer or food processor. Mix in the grated apple until combined in the wet mixture.
Add the dry mixture and mix for about a minute or until well mixed.
If you use single ring tins place them on a baking tray. Now scoop the paleo cake mixture evenly into your well oiled cake tins.
Place the tins in your preheated oven and bake for 15 minutest for single ring tins, 20-25 minutes if you are using a medium muffin tin. For a full ring cake or loaf, bake for 33-40 minutes or until a skewer poked into the cake comes out clean.
Remove from the oven and flip the tins over to cool upside down on a wire rack.