1.Cook Beef And Onion In 10-Inch Skillet Over Medium-High Heat Until Well Browned, Stirring To Break Up Meat. Pour Off Fat. 2.Stir Soup, Ketchup, Black Pepper And Peas And Carrots Into Skillet. Spoon Beef Mixture In 9-Inch Pie Plate. 3.Heat Milk And Butter In 2-Quart Saucepan Over Medium-High Heat To A Boil. Remove From Heat. Slowly Stir In Potatoes. Spoon Potatoes Over Beef Mixture. 4.Bake At 400 Degrees F For 15 Minutes Or Until Potatoes Are Lightly Browned.