Topping:
½ tsp. orange peel
1-2 Tbls. Buttermilk or milk
1 Tbls. sugar
Heat oven to 375 degrees. Grease round pizza stone. In a large bowl, stir together flour, sugar, baking powder, soda and salt. Cut butter into mixture til it resembles coarse crumbs. Stir in cranberries, vanilla chips, and orange peel. Add yogurt and 1/ 3 cup buttermilk; stir just until dry ingredients are moistened.
Shape dough into a ball; place on stone. With floured fingers, press dough into an 8-inch round. Brush dough with buttermilk or milk and sprinkle the sugar/orange peel mix over top. Bake 20-30 minutes or until edges are light golden brown. Cool 5 minutes. Cut into serving size pieces. Serve warm with lemon curd or berry preserves.