"In ‘750 Best Muffin Recipes’ by Camilla Saulsbury..."
INGREDIENTS
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1 1/2 cups all-purpose flour
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3/4 teaspoon baking powder
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3/4 teaspoon baking soda
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1/4 teaspoon salt
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2/3 cup packed dark brown sugar
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1 egg
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1/3 cup unsalted butter, melted
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2 teaspoons vanilla extract
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1 cup sour cream
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1 cup lightly salted roasted cashews, coarsely chopped
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1/2 cup English toffee bits