Preheat Oven to 425 degrees. In a large bowl, combine flour, 2/3 c. sugar, baking powder, baking soda, and salt. Add butter and cut in with a pastry blender or fork until mixture is coarse crumbs. Stir in buttermilk, then fold in chips and pecans.
Turn dough onto a floured surface and knead with a bit of flour until no longer sticky or just slightly sticky (my preference). Do not over work the dough. You can either form one big circle or split the dough into 2 pieces and make 2 smaller batches.
On a baking sheet (with parchment paper) or stone, form a circle with the dough. Using a pizza cutter, cut into equal sized wedges. Gently pull each wedge away from the middle to separate, so it's not longer touching the other wedges. They will be touching again once baking.
Brush each wedge with melted butter and sprinkle with sugar
Bake 10-13 minutes or until lightly brown. Serve warm!