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To make the crumb topping: In a medium bowl, whisk together flour, granulated sugar, brown sugar, cinnamon, allspice, and salt.
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Add butter and with your fingertips lightly rub butter and flour mixture together until mixture resembles very coarse meal.
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Set aside.
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To make the muffins: Preheat oven to 350.
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Spread sliced walnuts on a baking sheet or in a shallow pan.
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Bake, stirring once or twice, until lightly browned and fragrant, 5 to 10 minutes.
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Let cool.
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Leave oven set at 350.
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Line 24 (2 1/4-inch) muffin cups with paper baking cups, or coat with vegetable oil spray.
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In a medium bowl, combine sugar, flour, ground walnuts, cinnamon, ginger, allspice, baking soda, and salt.
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Whisk gently to blend.
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In a large bowl, whisk together pumpkin, eggs, butter, and oil until well blended.
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Stir in the toasted sliced walnuts.
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Stir in flour mixture just until dry ingredients are moistened (do not overmix).
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Spoon batter into muffin cups, filling each about three-fourths full.
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Sprinkle evenly with crumb topping.
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Bake until a toothpick inserted into the center of a muffin comes out clean, 15 to 20 minutes.
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Cool 5 minutes in the pans, then transfer to a wire rack.
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Serve slightly warm or at room temperature.
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Yields 24 muffins from the Diamond website http://www.
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diamondnuts.
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com/recipe_details.
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asp?
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id=54&cat=10.