INGREDIENTS
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1 1/4 cups all-purpose flour
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1 tsp baking powder
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1/4 tsp baking soda
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1/2 tsp salt
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1/2 tsp cinnamon
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1/4 tsp ginger
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1/8 tsp nutmeg
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1/4 cup butter, softened
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2/3 cup packed light-brown sugar
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1 egg
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1 tsp vanilla extract
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1/2 cup buttermilk
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3/4 cup sweet potato puree*
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2 Tbsp packed light brown sugar, divided
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3 cups mini marshmallows