Preheat your oven to 350 degrees Fahrenheit or 175 degrees Celsius.

In a large bowl, add the ripe bananas.

Mash the bananas with the back of a fork or a potato masher.

To the mashed bananas, add granulated sugar and brown sugar for sweetness.

Crack the eggs one by one and mix using a whisk or a hand mixer.

Add melted butter and vanilla essence to the egg mixture.

Mix the ingredients well until everything is combined.

Sift all-purpose flour, cocoa powder, and salt into the wet ingredients.

Using a spatula, fold the mixture until the batter is just combined.

Then, fold the semi-sweet dark chocolate into the batter evenly.

Pour the brownie batter into the prepared pan.

Place the peanut butter in the microwave to heat up for about 10 seconds.

Add spoonfuls of peanut butter on top of the brownie batter.

Use a butter knife to gently swirl the peanut butter into the brownie batter.

Bake the brownies in the preheated oven for about 25-30 minutes.

Once baked, remove the brownies from the oven and let them cool in the pan for another 25-30 minutes.

Use the parchment overhang to lift the brownies and transfer them to a wire rack to cool completely.

Slice the peanut butter brownies into any squares and enjoy the fudgy, nutty, and fruity treat!