Preheat oven to 400°F. Line baking sheet with parchment paper or silicone baking mat. Set aside.
In a large bowl, whisk together flour, baking powder, salt, and sugar. Toss in cubed butter. Cover and keep in the freezer for 15-30 minutes until ingredients are cold.
Remove bowl from freezer. Using a pastry cutter (pastry blender) or two forks, cut butter into flour until mixture resembles coarse sand. Add cream and whisked egg. Use a sturdy spatula to fold mixture together until shaggy mess dough forms.
Dump coarse dough onto a large sheet of parchment paper. Pour chocolate chips over dough. Use the edges of parchment paper to help fold and knead dough together. Use the palms of your hands to give the dough its final knead.
Pat dough out into a flat 8-inch round, about ½-inch thick. Use a sharp knife or a bench scraper to slice round into 8 equal sized wedges.
Transfer cut scones onto prepared baking sheet, allowing at least 2-inches between scones. Lightly brush scone tops with heavy cream. Generously sprinkle turbinado sugar on top.
Bake for 18-20 minutes until scones have puffed up and are golden brown on top. Allow scones to slightly cool on baking sheet before transferring to wire rack. Serve scones warm.