1 1/2 cups all-purpose flour
1 teaspoon baking soda
1 teaspoon baking powder
1/2 teaspoon salt
3/4 teaspoon ground cinnamon
3 bananas, mashed
1/2 cup granulated sugar
1/4 cup packed light brown sugar
1 large egg
1/3 cup vegetable oil
1 1/2 teaspoons pure vanilla extract

For the Crumb Topping

1/3 cup packed brown sugar
2 tablespoons all-purpose flour
1/8 teaspoon ground cinnamon
1 tablespoon butter