1.Stir The Stuffing, Soup, Corn, Onion And Celery In A Medium Bowl. Spoon The Stuffing Mixture Into A Greased 9-Inch Pie Plate. Top With The Pork. 2.Stir The Brown Sugar And Mustard In A Small Bowl Until The Mixture Is Smooth. Spread The Mixture On The Pork. 3.Bake At 400 Degrees F For 30 Minutes Or Until The Pork Is Cooked Through.