Batter

2 cups (454g) thoroughly mashed banana, about 4 or 5 medium bananas
1/2 cup (99g) vegetable oil
1 cup (213g) brown sugar, packed
2 large eggs
1 teaspoon vanilla extract
1 cup (120g) King Arthur Unbleached All-Purpose Flour
1 cup (113g) King Arthur White Whole Wheat Flour
1 teaspoon baking soda
1/2 teaspoon baking powder
3/4 teaspoon salt
1 teaspoon cinnamon
1/2 cup (57g) chopped walnuts, toasted if desired; optional*
*Leave the nuts out, if desired; or substitute up to 1 cup chopped dried fruit, chocolate or butterscotch chips, sunflower or pumpkin seeds, or other mix-ins of your choice.

Topping

1 tablespoon (13g) sugar
1/2 teaspoon cinnamon