Preheat your oven to 350°F. Rinse and drain the chickpeas very well.
Add the chickpeas to a food processor along with the peanut butter, maple syrup, cocoa powder, vanilla extract, baking powder, and baking soda. Pulse well until smooth (the batter will be thick), then add the milk and pulse again until the batter is smooth.
Mix in the chocolate chips.
Transfer the batter to a greased 9x4 loaf pan (or an 8x8 square pan for slightly thinner brownies). Sprinkle the remaining chocolate chips on top.
Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
Let the brownies cool for about 10 minutes before slicing. Enjoy!