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Beat butter and sugars together until light and fluffy.
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Add eggs and vanilla, and beat until combined.
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Add mashed banana. In a separate bowl, combine flour, baking powder and salt.
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Gradually add flour to butter/sugar mixture and mix until just combined.
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Stir in peanut butter chips.
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Set your broiler to high.
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On a lined baking sheet pour out marshmallow fluff or marshmallows.
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Broil until it turns golden brown about 3 minutes (but make sure you watch it!)
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Remove from oven and gently add to your cookie dough.
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Refrigerate dough for 30 minutes.
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Preheat your oven to 350 degrees.
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After dough has chilled, spoon out dough rounds and bake for 12-14 minutes.
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Consume with a large glass of milk!