01 -
Heat your oven to 350°F. Place parchment paper into a 9x13 baking dish and set it aside for now.
02 -
In another medium-sized mixing bowl, combine the baking powder, flour, and salt. Let it sit nearby.
03 -
In a large bowl, whisk together melted butter, mashed bananas, brown sugar, egg, and vanilla until smooth and blended.
04 -
Gently fold the dry mix into the wet mixture. Stir until no bits of dry flour are left.
05 -
Pour the batter evenly into your baking dish. Pop it in the oven for 30 to 35 minutes. It’s done when the edges are golden and a toothpick comes out clean from the center.
06 -
Take the dish out of the oven and place it on a cooling rack. Let it cool down fully before applying frosting.
07 -
As the bars cool, blend the cream cheese and softened butter in a large mixing bowl. Use a hand or stand mixer to get it creamy.
08 -
Slowly add the powdered sugar, mixing as you go. Add vanilla last, then whip for 3 minutes until airy and smooth.
09 -
Use the parchment to lift the bars out of the dish. Spread the frosting on top, slice into squares, and serve right away.