Start by preheating your oven to 350°F (175°C)
Place the butter in a small saucepan over medium heat and stir it constantly. After a few minutes, the butter will foam and eventually start to brown. (see above photos for reference) Once it reaches a golden brown color and develops a nutty aroma (about 4-5 minutes), remove it from the heat and set it aside to cool slightly.
1/2 cup Butter
While the butter cools, mash up your ripe banana in a large bowl until smooth, then add the brown sugar, browned butter, followed by the egg, egg yolk, and vanilla extract, then mix together ensuring everything is evenly incorporated.
3/4 cup Brown Sugar, 1 large Egg, 1 Egg Yoke, 2 tsp. Vanilla Extract, 1 medium Ripe Banana
In a separate bowl, whisk together the flour, salt, cinnamon, and baking soda. Gradually add the dry ingredients to the wet mixture, stirring until just combined—be careful not to overmix.
1&1/4 cup Flour, 1/4 tsp. Salt, 1/2 tsp. Cinnamon, 1/2 tsp. Baking Soda
Next, prepare an 8x8-inch baking pan by lining it with parchment paper, and pour the batter into the pan, spreading it evenly. For an extra touch of sweetness and crunch, sprinkle a light layer of sugar over the top of the batter before placing it in the oven.
Sugar (for topping)
Preheat your oven to 350°F (175°C), and bake for 20-25 minutes or until a toothpick inserted into the center comes out clean or with just a few moist crumbs.
Let the squares cool in the pan for about 10 minutes before transferring them to a wire rack to cool completely. & ENOJOY!