INGREDIENTS
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1/2 cup unsalted butter, softened
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3/4 cup sugar
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1 egg
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1 tsp vanilla
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2 Tbsp sour cream
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2 cups flour (all purpose or white whole wheat)
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1 tsp baking soda
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1/2 tsp salt
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1/4 tsp cinnamon
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1 cup mashed banana, about 3 small or 2 medium
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3/4 cup mini chocolate chips, divided