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Preheat oven to 325 degrees.
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Sift together flour, sugar, baking powder, salt and spices into a large mixing bowl.
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Make a well in the center and add the corn oil, milk, pumkin, egg yolks and vanilla.
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Beat by hand until smooth.
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In a clean medium bowl, beat egg whites and cream of tartar with an electric mixer until egg whites form straight, stiff peaks when the mixer is slowly raised.
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Fold egg whites into pumpkin batter gently, mixing only until the whites are distributed through batter, showing small white blobs.
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Pour into an ungreased 8x8 inch baking pan.
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Bake at 325 degrees for 35 minutes, or until top springs back when lightly pressed with finger.
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Cool slighly.
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Serve warm with custard sauce or ice cream.