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Preheat oven to 350 convection or 375 regular bake and place rack in center of oven.
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In large bowl, or bowl of stand mixer, cream butter and sugar on medium speed.
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Add eggs and vanilla, beat until blended well.
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Add flour, baking soda and powder, cream of tartar and salt to bowl.
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Mix on low just until flour disappears.
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Scoop dough into balls ( I used a 2 tablespoon size scoop), 6 scoops of dough per pan.
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Roll one side of dough ball into cinnamon sugar topping. Place dough ball onto cookie sheet sugar dipped side up.
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Bake at 350 convection for about 10-11 minutes; or on regular bake 375 for about 12 minutes.
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The dough should spread a bit and be a bit puffy. If the cookies are not round in shape when removed from oven, push the edges in with a small spatula until the cookie is circular in shape.
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Let cool completely on cookie sheet.
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The cookies should be a bit golden on top and have a golden bottom.