Royal Wedding Scones

INGREDIENTS

• 1 1/2 teaspoon pure vanilla extract
• 3/4 cups frozen wild Maine blueberries
• 1 large egg
• 1 tablespoon baking powder
• 2 1/2 cups (11.25 ounces) all-purpose unbleaced flour (I use King Arthur Flour)
• 6 tablespoons chilled unsalted butter, cut into small cubes
• 1/4 cup granulated sugar, plus more for sprinkling on tops of scones
• 1 cup heavy cream, plus more for brushing on tops of scones
• 3/4 teaspoons kosher salt