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Preheat oven to 350 F degrees.
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Spray two baking sheets with non-stick cooking spray.
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Combine sour cream and baking soda in a small bowl.
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Combine flour, sugar, baking powder, cream of tartar and salt in another bowl.
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Cut in butter until mixture resembles fine breadcrumbs.
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Combine egg with sour cream mixture, add cinnamon.
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Gently stir into flour mixture until moistened.
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IMPORTANT: knead dough briefly, no more than 10 times.
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Divide dough into two, place on baking sheet and pat into 3/4 inch thickness.
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Cut each round into 6 wedge-shaped pieces.
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Move scones so they are not touching (at least 3 inches), dust with sugar and cinnamon.
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Bake 15-20 minutes or until golden brown.