Preheat the Oven: Start by preheating your oven to 350°F (175°C). Grease a 9x13 inch baking pan to ensure your bars come out easily once baked.
Combine Wet Ingredients: In a mixing bowl, beat the softened butter, granulated sugar, and brown sugar until it's light and fluffy. Next, add the mashed bananas, eggs, and vanilla extract, mixing until everything is well incorporated.
Mix Dry Ingredients: In a separate bowl, whisk together the flour, baking soda, and salt.
Combine Wet and Dry Mixtures: Gradually add the dry ingredients to the wet mixture, stirring just until combined. Avoid over-mixing to keep the bars tender.
Bake: Pour the batter into the prepared baking dish and smooth out the top. Bake for 25-30 minutes or until a toothpick inserted in the center comes out clean.
Cool: Let the bars cool in the baking pan for about 10 minutes, then transfer them to a wire rack to cool completely.
Prepare Frosting: In a mixing bowl, beat together the softened cream cheese and butter until smooth. Gradually add the powdered sugar and vanilla extract, mixing until creamy.
Frost the Bars: Once the bars are completely cool, spread the cream cheese frosting generously over the top, then slice into squares and serve!
