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Preheat oven to 350 degrees F and grease an 8x8 inch square pan.
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Cream the butter, add the sugar and continue creaming until light and fluffy.
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Beat in the eggs one at a time.
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Stir in the maple flavoring.
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Combine the flour, baking powder, and salt.
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Add the flour mixture in 3 parts alternately with the milk to the butter mixture, beginning and ending with flour.
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Stir in the walnuts and pour in the prepared pan.
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Bake at 350 degrees F for 40-45 minutes or until an toothpick inserted in the center comes out clean.
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Let cake cool completely, then frost with Maple Butter Frosting.