Chocolate Pumpkin Muffins
Ingredients:
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1 cup all-purpose flour
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¼ cup cocoa powder
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1 tablespoon pumpkin pie spice
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½ teaspoon baking soda
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¼ teaspoon baking powder
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¼ teaspoon salt
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¾ cup brown sugar
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1 cup pumpkin puree
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2 large eggs
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¼ cup vegetable oil
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¼ cup sour cream
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1 teaspoon vanilla extract
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1 cup chocolate chips, divided