Preheat oven to 350°F. Line an 8 x 8 inch baking pan with parchment paper.
In a large microwave-safe bowl, add chocolate chips. Heat chocolate in the microwave in 1 minute intervals, stirring in between, until chocolate is fully melted. Mine took 2 minutes total heat time. Your chocolate should be smooth and liquid when you're done. You can also melt chocolate on the stove using the double boiler method.
Add pureed bananas to the chocolate. Use a whisk and mix until banana is completely incorporated into the chocolate and evenly mixed in.
Pour batter into prepared baking pan. Bake for 38-40 minutes. The surface of the brownies should no longer look wet but they should not be fully set. If you press the surface, it should be soft underneath. The edges of the brownies should pull away slightly from the pan and be a slightly darker shade of brown.
Brownies will firm up as they cool. Let brownies set before cutting. Brownies are best enjoyed warm.
Notes
For best results, use dairy-free semisweet chocolate chips. It may still work with some brands of chocolate that contain dairy (depending on how much they add) but the milk causes the brownies not to set as well. This recipe will not work with white chocolate.
The 1 cup of banana puree is measured after the bananas have been pureed. You will need about 3 bananas to make 1 cup of puree. Make sure to puree the bananas in a food processor or blender. Just mashing them is not enough.
I recommend mixing the batter with a whisk; this will help ensure that the banana puree has been evenly mixed in with the chocolate.
These brownies have a chewy crumb and a gooey, fudgy center.
The brownies are best enjoyed warm. When they are fully cooled (a few hours after baking), they will firm up a lot and lose their crumb. They will taste more like fudge rather than brownies. However, you can reheat them briefly in the microwave for a few seconds and they will become like brownies again.
You can eat the brownies right away but they won't be set. Let them cool a little (30-60 minutes) which will let them firm up enough to cut.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.