In a medium bowl, mix together the flour, sugar, salt and baking powder. Dice the chilled butter into smaller pieces and cut it into the dry ingredients using a fork or pastry cutter until it’s pea-sized crumbs. Stir in half and half until dough is sticky but still a little crumbly, adding more half and half if needed. Set dough onto a floured surface and form into rough disk shape. With a floured rolling pin, roll until 1/8″ thick and then carefully place in skillet, covering up the sides, about 3/4 of the way up.