01 -
Preheat oven to 350°F. Grease and line a 9-inch square baking pan with parchment paper.
02 -
In a large mixing bowl, whisk together all-purpose flour, whole wheat flour, baking powder, baking soda, salt, and ground cinnamon until evenly distributed.
03 -
In a separate bowl, whisk together melted butter, maple syrup, eggs, and vanilla extract until fully emulsified.
04 -
Fold mashed ripe bananas into the wet mixture, ensuring even incorporation without overmixing.
05 -
Gently fold the wet mixture into the dry ingredients using a spatula. Mix just until combined; the batter will remain slightly lumpy.
06 -
Spoon the batter into the prepared baking pan and spread evenly with a spatula.
07 -
Bake in the center of the oven, uncovered, for 28-32 minutes or until a toothpick inserted into the center emerges with just a few moist crumbs.
08 -
Allow cake to cool in the pan for 15 minutes before removing to a wire rack. Slice and serve warm or at room temperature.