Start by cutting up the butter and placing it in the freezer for 10 minutes.
In a food processor (or stand mixer), combine the dry flour, baking powder, sugar, and salt. Add the cold butter and lemon zest pulse (or mix on medium-low) until the mixture resembles damp sand.
2 cups all-purpose flour, 1 tablespoon baking powder, ¼ cup sugar, ½ teaspoon salt, 1 tablespoon lemon zest, 5 tablespoon butter
Pour the mixture into a large bowl (or leave in the stand mixer bowl). Stir in the berries. Then add the cream and vanilla and mix with a rubber spatula until the dough begins to form. It will look dry and shaggy, but will come together in the next step.
¾ cup fresh blueberries, 1 cup heavy cream , 1 teaspoon vanilla
Transfer the dough onto a lightly floured surface. Work the dough for 5-10 seconds, or until the dough fully comes together.
Pat the dough into a circle that is about ¾ inch thick and 7.5 inches wide. Cut into 8 even wedges.
Refrigerate the scones for 15 minutes. Meanwhile, preheat the oven to 425°F. Line a cookie sheet with parchment paper.
After refrigerating, brush the tops with about 2 tablespoons of heavy cream and sprinkle with sanding sugar or lemon sugar. 2 tablespoon sanding sugar
Bake for 13-15 minutes, or until golden brown. Cool on the pan for 10 minutes.