Preheat the oven to 350°F and line an 8×8-inch baking pan with parchment paper or grease it lightly.

Add the drained black beans, eggs, cocoa powder, baking powder, sugar, oil, and vanilla extract to a blender or food processor.

Blend until the mixture is completely smooth and thick, stopping to scrape down the sides as needed.

Stir in the chocolate chips with a spatula until evenly distributed.

Pour the batter into the prepared pan and spread it evenly. Sprinkle a few extra chocolate chips on top if desired.

Bake for about 20–25 minutes, or until the edges are set and a toothpick inserted in the center comes out mostly clean with a few moist crumbs.

Let the brownies cool completely in the pan before cutting into squares.