Preheat oven to 350°F.
Butter an 8-inch baking pan. Place the black
beans, eggs, melted butter, cocoa powder, salt,
vanilla extract and sugar in the bowl of a food
processor and blend until smooth. Remove the blade
and gently stir in the chocolate chips and
walnuts. Transfer mixture to the prepared pan.
Bake the brownies for 30 to 35 minutes, or until
just set in the center. Cool before cutting into
squares.
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