All-purpose flour • Baking powder • Salt • Unsalted butter (room temperature) • g+ 1 tablespoon for topping Granulated sugar • large Eggs • Vanilla extract (if you don't have vanilla rum) • Dark rum vanilla • medium (about 2 1/2 cups) Baking apples (such as Granny Smith or Honeycrisp), peeled, cored, cut into 1/2-inch cubes • for dusting Confectioners’ sugar (optional)