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Preheat oven to 350 ℉.
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Rinse off black beans.
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In a food processor add all the ingredients except chocolate chips.
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Blend until completely smooth.
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Stir in chocolate chips.
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Pour into a greased 8x8 pan.
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Spoon globs of peanut butter on top of batter. Use a knife to swirl the peanut butter around.
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Sprinkle chocolate chips on top (optional but highly recommended).
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Bake for 15-18 minutes.
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Let cool at least 10 minutes before cutting.
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Enjoy!