INGREDIENTS
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1 1/4 cup all-purpose flour
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1 teaspoon baking powder
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1/4 teaspoon baking soda
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1/2 teaspoon salt
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1/2 teaspoon cinnamon
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1/2 teaspoon ginger
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1/8 teaspoon 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 teaspoon vanilla extract
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1/2 cup buttermilk
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3/4 cup sweet potato puree
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Topping:
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2 tablespoon packed light brown sugar, divided
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3 cup mini marshmallows