Preheat your oven to 350°F (175°C). Line an 8x8-inch square baking pan with parchment paper, leaving a slight overhang on the sides for easy removal.
Place the rinsed and thoroughly drained black beans, rolled oats, cocoa powder, maple syrup, melted coconut oil, vanilla extract, baking powder, and salt into a food processor or high-speed blender.
Process the mixture on high until completely smooth. You may need to stop and scrape down the sides a few times. It is crucial that the batter is entirely smooth so there are no bean chunks left!
Remove the blade from the processor and gently fold in 1/2 cup of the dark chocolate chips using a silicone spatula.
Pour the thick batter into the prepared baking pan, using the spatula to spread it evenly into the corners.
Sprinkle the remaining chocolate chips evenly over the top of the batter.
Bake for 20 to 25 minutes, or until the edges look visibly baked and the center no longer jiggles. The brownies will still seem slightly underbaked, but they will firm up significantly as they cool.
Let the brownies cool in the pan on a wire rack for at least 30 minutes before lifting them out by the parchment paper and slicing.