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Preheat oven to 350 degrees
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Cover a cookie sheet with parchment paper and set aside
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Using a standing mixer, cream together the butter, powder sugar, vanilla and egg and mix until combined and creamy
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Using a large bowl, combine the flour, baking soda and cream of tartar
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Gradually add in the dry ingredients and mix on low speed
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Using your hands continue to mix until fully combined
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Lightly flour a cutting board and knead the cookie dough a couple of times
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Roll out the dough to about 1/2 inch thick
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Cut out a few Mickey heads and place onto the cookie sheet
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Bake for 8 minutes or until lightly golden brown
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Repeat steps until completely out of dough
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Let cookies cool completely