Blueberry Buttermilk Scones

Ingredients

• ✓ cooking spray
• ✓ 2 cups all-purpose flour
• ✓ 4 tablespoons white sugar, divided
• ✓ 2 teaspoons baking powder
• ✓ ½ teaspoon baking soda
• ✓ ½ teaspoon salt
• ✓ ½ teaspoon ground nutmeg
• ✓ ½ cup butter, cut into chunks
• ✓ 1 cup fresh blueberries
• ✓ ¾ cup buttermilk
• ✓ 1 egg white, lightly beaten
• ✓ 1 tablespoon powdered sugar, or to taste