Chef John's Scones

Ingredients (9)

• + 1 ¾ cups all-purpose flour add to pantry
• + ¼ cup white sugar add to pantry
• + 4 teaspoons baking powder add to pantry
• + ⅛ teaspoon salt add to pantry
• + 5 tablespoons unsalted butter add to pantry
• + ½ cup milk add to pantry
• + ¼ cup sour cream add to pantry
• ✓ ⅓ cup dried currants
• + 1 egg, lightly beaten add to pantry