Preheat the oven to 350°F. Lightly oil or coat an 8 X 8-inch baking pan or dish with nonstick cooking spray and set aside.
Place the black beans in the bowl of a food processor and process until smooth and creamy. Add the eggs, applesauce, sugar, cocoa powder, vanilla, peppermint extract as desired, baking powder, and salt and process until smooth. Add ¼ cup of the chips and pulse a few times until the chips are incorporated.
Pour the batter into the prepared pan, smooth the top with a rubber spatula, and sprinkle with the remaining ¼ cup chocolate chips.
Bake 30 to 35 minutes, or until the edges start to pull away from the sides of the pan and a toothpick inserted in the center comes out clean. Cool in the pan before slicing into 2-inch squares.
Notes
Recipe by Liz Weiss, MS, RD and Janice Newell Bissex, MS, RD