2 ripe bananas, mashed
1/2 cup unsalted butter, softened
1/2 cup brown sugar, packed
1/4 cup granulated sugar
1 large egg
1 teaspoon vanilla extract
1 1/2 cups all-purpose flour
1/2 teaspoon baking soda
1/4 teaspoon baking powder
1/4 teaspoon salt
1/2 teaspoon ground cinnamon
1/2 cup chopped walnuts or pecans (optional)
1/2 cup chocolate chips