Snickerdoodle Scones

Preheat oven to 350º.
Spray baking sheet with cooking spray.
Combine sour cream and baking soda in a small bowl. Set aside.
Combine flour, sugar, baking powder, cream of tartar and salt in another bowl.
Cut in butter until mixture resembles fine breadcrumbs.
Combine egg with sour cream mixture. Add cinnamon.
Gently stir into flour mixture until moisted.
Place on baking sheet and pat into a 3/4 inch thick circle.
Cut into 8 wedge shaped pieces. Move slightly so they are not touching.
Dust with cinnamon-sugar.
Bake 15 to 20 minutes or until golden brown.