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preheat oven to 350.
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beat butter and sugar until light and fluffy.
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mix in egg and vannila extract.
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add flour and cornstarch and mix just until blended.
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add food coloring and refrigerrate for 3 hours (optional).
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transfer dough to cookie press.
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press onto ungreased backing sheets forming any shape you want.
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bake until light brown and firm to touch,about 10 minutes.
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transfer to racks and cool.
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store in air tight container.