In a large bowl, whisk together flour, baking powder, ½ teaspoon salt, and ¼ teaspoon pepper. In a separate bowl, whisk together water and melted butter. Using a rubber spatula, stir the butter mixture into the flour mixture just until incorporated. Turn the dough out onto a lightly floured counter and knead for about 1 minute, adding additional flour to the counter and to your hands, if necessary, to prevent sticking. Return the dough to the large bowl, cover with plastic wrap, and set aside while you prepare the chicken.