Make banana puree - you could use a food processor or just a fork.
Add a teaspoon of cinnamon powder, a tablespoon of olive oil, and as many nuts as you like.
Add little by little buckwheat flour and mix with a wooden spoon carefully. Keep adding flour until you reach your desired consistency.
Pre-heat oven for 5 minute, and then bake for 50 minutes at 165C

4 ripe bananas
2 cup buckwheat flour
1 tablespoon cinnamon powder
1 tablespoon olive oil
1 cup nuts (pecan or walnut), crushed to bits