Preheat oven to 350°F (180ºC). Line an 8-by-8-inch baking pan with parchment paper and set aside.
In the bowl of a food processor, puree the black beans on high speed until almost smooth, stopping to scrape down the sides of the bowl as needed.
Add butter and vanilla; process until smooth.
Add eggs; pulse 3–4 times to combine.
Add sugar, cocoa, coffee, baking soda and salt; pulse 4–5 times to combine.
Add chocolate chips; pulse once or until just combined.
Spoon batter into a prepared pan.
Bake at 350°F for 26–30 minutes or until set.
Cool in pan on a wire rack.
