Chocolate-Banana Muffins
Ingredients:
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1 ½ cups mashed banana
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⅓ cup oil
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⅓ cup milk, or as needed
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1 medium egg, beaten
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1 ½ teaspoons vanilla extract
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2 cups all-purpose flour
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2 teaspoons cocoa powder
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½ cup white sugar
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1 tablespoon baking powder
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½ teaspoon salt
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1 cup chocolate chips