"A burst of sunshine in a muffin. Use your favorite nuts instead of the walnuts...."
INGREDIENTS
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1 3/4 cups flour
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1 cup chopped walnuts
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1/3 cup sugar
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2 teaspoons baking powder
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2 teaspoons grated lemon zest
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1/2 teaspoon salt
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1 egg
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1/2 cup milk
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1 1/3 cups butter, melted
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1/4 cup sour cream
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3 tablespoons flour
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3 tablespoons sugar
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3 tablespoons chopped walnuts
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2 tablespoons butter, softened
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2 teaspoons grated lemon zest