In a large bowl, mix the dry ingredients for the dumplings together. Add the shortening and butter and cut in with a pastry cutter. Work together until it’s evenly mixed, but don’t overwork. Add in 3/4 cup of the milk and stir gently until you have a nice dough. If it’s too dry add in the rest of the milk. Too wet add a little bit of flour. Set to the side and allow it to rest for at least 20 minutes.