Preheat your oven to 350°F (175°C). Grease and flour a 9x13 inch baking dish, or line it with parchment paper.

In a large bowl, cream together the softened butter and sugar until light and fluffy.

Beat in the eggs one at a time, then stir in the mashed bananas.

In a separate bowl, whisk together the flour, cocoa powder, baking powder, baking soda, and salt.

Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Do not overmix.

Pour the batter into the prepared baking dish and spread evenly.

Bake for 20-25 minutes, or until a toothpick inserted into the center comes out with moist crumbs attached.

Let the brownies cool completely in the pan.

While the brownies are cooling, prepare the frosting. In a medium bowl, beat together the softened cream cheese and butter until smooth and creamy.

Stir in the strawberry jam until well combined.

Gradually add the powdered sugar, alternating with the milk, beating until the frosting is smooth and spreadable. Add a drop of red food coloring if desired for a pink hue.

Once the brownies are completely cooled, spread the strawberry cream cheese frosting evenly over the top.

Cut the brownies into squares. Top each square with sliced bananas, a dollop of whipped cream, chopped walnuts, and a maraschino cherry, if desired, to create your sundae.