"What a winning combination! They rise up tall and high and are topped with a delicious buttery cinnamon crumble...."
INGREDIENTS
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1 tablespoon cold butter
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1/3 cup firmly packed brown sugar
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1/2 teaspoon ground cinnamon
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1/2 cup finely chopped walnuts
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For the muffins:
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1/2 cup vegetable oil
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1 1/3 cup packed brown sugar
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1 egg
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2 teaspoons vanilla extract
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1 cup buttermilk
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2 1/2 cups all-purpose flour (you may need a bit more, if the batter is too wet)
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1/4 teaspoon salt
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2 1/2 teaspoons baking powder
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1/2 teaspoon baking soda
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1 3/4 cups coarsely chopped peeled* apple
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2 tablespoon butter
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1/4 cup brown sugar
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2 tablespoons milk
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1 teaspoon vanilla extract
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1 cup powdered sugar