Salted Caramel Apple Hand Pies

Whisk together the flour, salt and baking powder in a large bowl. Add the cubed butter to the bowl and use your fingers to work the butter into the flour until the mixture is the consistency of wet sand. Stir in the sour cream (the dough will be very wet), and then turn the dough out onto a well-floured work surface. Knead the dough a few times until it comes together, adding more flour, 1 teaspoon at a time, if the dough is too sticky to handle. Roll the dough into an 8x10-inch rectangle and dust both sides with flour before folding it into thirds as if you were folding a letter. Rotate the dough 90 º and roll it out again into an 8x10-inch rectangle. Fold the dough again into thirds then wrap it securely in plastic wrap and refrigerate it for at least 30 minutes while you make the filling.