Put the coconut oil into a large baking trayTurn the oven on to 180 degrees/160 fan/gas 4 and place the baking tray and coconut oil inside while it heats up (to melt the oil)Meanwhile mix together the nuts, seeds and coconut flakesCarefully remove the tray from the oven and mix the nut and seed mixture around the tray, coating it in coconut oilPlace back in the oven for 5 minutesMeanwhile peel and chop the banana, then mash well with a fork until smoothRemove the nut mixture from the oven and stir the mashed banana in wellReplace in the oven for 10 more minutes before stirring againBake for a final 5 - 10 minutes until the mixture is crisp and dryFinally stir in the ground cinnamon and ginger before allowing to cool completely and storing in an airtight container