Add the flour, cornstarch, sugar, baking powder, and salt to the bowl of a food processor. Pulse 5-10 times, or until well combined.
1¾ cups all-purpose flour, ¼ cup cornstarch, ⅓ cup granulated sugar, 1 tablespoon baking powder, ½ teaspoon kosher salt
Add the cubed butter and pulse until the butter is the size of peas, about 10 pulses.
½ cup unsalted butter
In a large bowl, whisk the heavy cream, egg, and vanilla together. Add the butter-flour mixture to the wet ingredients and mix until the dough begins to come together into large clumps. Fold in the chocolate chips.
¾ cup heavy cream, 1 large egg, 1 teaspoon pure vanilla extract, 1 cup chocolate chips
Turn the dough out onto a lightly floured surface and shape it into an 8-inch round circle. It may look dry at first, but keep working it with your hands and it will come together! Cut the dough into 8 triangles.
Place the scones on a parchment-lined baking sheet, making sure to place them at least 2 inches apart. They will spread a little while baking.
Place the scones in the freezer to chill for 30 minutes. While the scones chill, preheat oven to 350°F.
When the oven is fully preheated, brush the scones with heavy cream and sprinkle them with coarse sugar, if desired. Bake for 22-25 minutes, or until the scones are puffed and golden brown around the edges.
Coarse sugar
Allow the scones to cool completely before enjoying.