Combine flour, baking powder, baking soda, salt, and sugar in mixing bowl. Add butter slowly, mixing well.
In a seperate bowl, combine egg yolk, vanilla, and buttermilk. Add to dry ingredients, mixing completely. Stir in cinnamon chips.
On a floured surface, roll out dough (with hands only) to 1/2" thickness. Cut into scones, place on ungreased cooking sheet. Brush egg white over scones and sprinkle cinnamon sugar over scones. Bake 18 minutes.
Cool scones 5 minutes, move to plate and cover until completely cool.