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Preheat oven to 350.
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Cream butter and sugars together.
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Add in egg. Beat until fluffy.
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Add in milk, vanilla and root beer concentrate.
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Add in flour, cream of tartar, baking soda. If dough seems a bit dry add it a little more milk, but just a little.
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Mix in chips
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Bake on an ungreased cookie sheet for 10 minutes. Remove from oven and let cool for about 5 minutes and then move to a wire rack.