Preheat oven to 400°F and line a baking sheet with parchment paper
Combine flour, sugar, baking powder, and salt in a large mixing bowl
Cut cold butter into dry ingredients until mixture resembles coarse sand with pea-sized chunks
Stir in chocolate chips to distribute evenly throughout flour mixture
Whisk together heavy cream, egg, and vanilla extract in separate container
Pour wet ingredients into flour mixture and stir with fork just until dough begins to clump
Turn shaggy dough onto lightly floured surface and gently pat into 8-inch circle, 1 inch thick
Cut circle into 8 equal wedges using sharp knife or bench scraper
Transfer wedges to prepared baking sheet, spacing 2 inches apart
Brush tops with additional heavy cream and sprinkle with coarse sugar
Bake 16-18 minutes until edges are golden brown and tops are lightly colored
Cool on baking sheet for 5 minutes before transferring to wire rack
