01 -
Preheat the oven to 350°F. Grease and line an 8-inch square baking pan with parchment paper, allowing overhang for easy removal.
02 -
In a large mixing bowl, beat the softened butter with granulated sugar until light and fluffy using an electric mixer on medium speed.
03 -
Add eggs one at a time, mixing well after each addition. Blend in the mashed bananas, maple syrup, and vanilla extract until just combined.
04 -
In a separate bowl, whisk together all-purpose flour, whole wheat flour, cinnamon, baking powder, baking soda, and salt.
05 -
Gently fold the dry ingredients into the wet mixture using a spatula until just combined. Do not overmix; the batter should remain slightly lumpy.
06 -
Pour batter evenly into the prepared baking pan. Smooth the surface with a spatula. Bake in the preheated oven for 30–35 minutes or until a toothpick inserted in the center comes out with a few moist crumbs attached.
07 -
Allow cake to cool in the pan for 10 minutes. Use parchment overhang to lift the cake onto a wire rack to cool completely before slicing. Serve warm or at room temperature.