Preheat oven to 350° F
Combine all dry ingredients in a bowl
Mash overripe bananas with a fork (if bananas are not ripe enough, put them in the oven for 5-15 minutes or until dark brown)
Melt butter
Beat large egg in a bowl
Combine wet ingredients with the mashed bananas
Combine all wet and dry ingredients and mix well (until smooth)
Sprinkle cinnamon over top and mix in
Pour into 8x10 baking pan
Bake at 350° for 55-65 minutes or until golden and cooked through
Allow rest for 15-20 minutes
Slice and eat with vanilla ice cream on top