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
Next 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 together the heavy cream, egg, and vanilla. Add the butter-flour mixture to the wet ingredients and mix until the dough begins to come together into large clumps. If using any add-ins, add them to the dough now.
¾ cup heavy cream, 1 large egg, 1 teaspoon pure vanilla extract, Raspberries, Blueberries, Chocolate chips, Cheddar cheese
Turn the dough out onto a lightly floured surface and shape it into an 8” 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 your oven to 350°F.
When the oven is fully preheated, brush the scones with egg wash and sprinkle them with coarse sugar, if using. Bake for 22-25 minutes, or until the scones are puffed and golden brown around the edges.
1 large egg, 1 teaspoon water
Allow the scones to cool completely before enjoying.