Pre-heat the oven to 350°F.
Coat the skillet with the softend tablespoon of butter.
Sift the flour, baking soda, cream of tartar, and cinnamon together in a bowl; set aside
Using the paddle attachment on the mixer, blend the butter and sugar together on medium speed until combined; scrape down the sides.
Add the egg and vanilla; mix to combine; scrape down the sides.
Slowly and a bit at a time while mixing, add the dry ingredients to the creamed mixture.
Add the dough to the prepared skillet; pressing down to be even.
Sprinkle the cinnamon-sugar blend over the dough.
Sprinkle the turbinado sugar over the seasoned dough.
Bake for 25 minutes or until a toothpick comes out clean.
Allow to rest for 5 minutes, either in the skillet or transfered to a cooling rack.
Slice, serve and enjoy, especially with the optional scoop of vanilla ice cream and caramel sauce.