INGREDIENTS
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Ingredients for the streusel topping:
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1 tablespoon cold butter
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⅓ cup firmly packed brown sugar
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½ teaspoon ground cinnamon
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½ cup finely chopped walnuts
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Ingredients for the muffins:
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½ cup vegetable oil
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1-⅓ 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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2-½ cups all-purpose flour (you may need a bit more, if the batter is too wet)
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¼ teaspoon salt
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2-½ teaspoons baking powder
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½ teaspoon baking soda
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1-¾ cups coarsely chopped peeled* apple
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Ingredients for the caramel icing:
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2 tablespoon butter
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¼ 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