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Begin by opening the can of black beans, then thoroughly drain and rinse them under cold water.
Return the rinsed beans to the can and fill the can with fresh water.
Transfer the beans and water into a blender and blend until the mixture is completely smooth.
Combine the pureed bean mixture with the brownie mix in a large bowl.
It’s important to omit any eggs or oil from the mixture.
Lightly coat a baking dish with cooking spray.
Bake the brownies following the instructions provided on the package.
Allow to cool before slicing and serving.