Preheat oven to 350 F. Grease or oil a 12 cup muffin pan.
In a medium mixing bowl combine: 2 ½ teaspoon melted butter or coconut oil, 2 ½ tablespoon coconut sugar and ¼ teaspoon cinnamon. Mix together and dividing equally, place at the bottom of each muffin cup.
Sprinkle crushed nuts on top of mixture in each muffin cup and place three banana slices in each muffin cup. Set aside.
In a large mixing bowl combine all the banana cake ingredients and stir until thoroughly combined.
Divide banana cake batter equally and place in each muffin cup on top of banana slices. Smooth and cover slices evenly with the batter in muffin cups.
Bake for 25 mins or until toothpick comes out on center clean.
Remove from oven and cool. Once cooled, use a butter knife in between muffin and pan cups and slide around to loosen. Turn mini cakes upside down onto a serving platter.