Blueberry Creme Fraiche Scones

Bahan-bahan (12 porsi)

• 2 cups all-purpose flour (plain flour)
• ¼ cup sugar
• 2 tsp baking powder
• ½ tsp Diamond Crystal kosher salt
• 6 Tbsp unsalted butter ((¾ stick; chilled))
• 1 ½ cup blueberries ((picture shows 2 cups, but I just needed 1 ½ cup))
• 1 large egg (50 g w/o shell)
• 1 large egg yolk
• 7.5 oz crème fraîche
• 1 ½ tsp pure vanilla extract
• white sparkling sugar ((for sprinkling; I did not have it today))