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Heat oven to 375°F.
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Grease the bottom only. of a 13x9-inch baking pan.
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In a large bowl combine sugar and butter; blending well,
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Lightly spoon flour into measuring cup; level off.
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Add flour, ginger, cinnamon, allspice, and salt; mix until crumbly.
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Reserve a 1/3 cup of the mixture for the topping; set aside.
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To the remaining mixture, add baking soda; mix well.
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Add buttermilk, molasses and egg; blend well.
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Pour batter into prepared pan; sprinkle with reserved crumb mixture.
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Bake 25-35 minutes or until a toothpick inserted in the center comes out clean.