In a food processor, pulse flour, cornstarch, baking powder, salt, and sugar to combine. Add the chilled butter pieces and pulse until the mixture resembles coarse crumbs. Transfer to a large mixing bowl; set aside in the freezer while mixing the wet ingredients. (Alternatively, cut the butter into the flour in a large mixing bowl using a pastry cutter, two forks, or with your hands). Toss in the chocolate chips and pecans.
In a medium mixing bowl, whisk together heavy cream, eggs, clear vanilla, and pure vanilla extract. Pour over the flour mixture, then mix until combined. Turn dough onto a floured surface, and with floured hands, knead the dough into a ball shape; don’t worry if it’s sticky. If the dough is dry, add 1 tablespoon of heavy cream.
Shape into a circle and pat it until it is 12 inches in diameter and about 1 inch thick. Using a knife or bench scraper, cut into 8 or 12 wedges. Pull the wedges and transfer them to a parchment paper-lined baking sheet about an inch away. Freeze or refrigerate unbaked scones for a minimum of 15 minutes.
Camila Made Tip: Don’t overwork the dough; mixing and kneading are both actions that develop gluten, which makes for chewy breads as opposed to tender, cakey crumbs for scones. Mix dough gently with a wooden spoon, and gently pat when shaping to keep from overworking.
Meanwhile, preheat the oven to 400ºF. Brush the tops of the scones with heavy cream and sprinkle with coarse sugar for texture if desired. Bake for 18–20 minutes until golden brown.
Remove the Chocolate Chip Scones from the oven and allow them to cool for 15 minutes on the cookie sheet, then transfer them to a cooling rack to cool completely.