Strong bread flour • Unsalted butter, cut into cubes • Baking powder • Granulated sugar • Salt • Egg, large size, about 60g • Soy milk or Milk • Egg wash • Bake at 220℃ / 428 F for 5 minutes, then 190℃ / 374 F for 13 minutes, for a total of 18 minutes. (Preheat to 220℃.) • Cream cheese, room temperature • Salted butter, room temperature • Frozen blueberries •