Step #2 Heat oven to 400°F In ungreased 8-inch square (2-quart) glass baking dish, contents of sauce packet from potatoes, mix potato slices, margarine & boiling water; mix well.
Step #3 Stir in milk.
Step #4 Bake at 400°F for 20 mins.
Step #5 2.
Step #6 Meanwhile, cook ground beef & onion in large skillet over medium-high heat until beef is thoroughly cooked & onion is tender, stirring frequently.
Step #7 Drain if necessary.
Step #8 Stir in ketchup & pepper.
Step #9 Keep warm.
Step #10 3.
Step #11 Remove baking dish from oven.
Step #12 Stir potatoes carefully.
Step #13 Spoon meat mixture over potatoes.
Step #14 Top with tomato slices.
Step #15 Sprinkle top with cheese.
Step #16 4.
Step #17 Return to oven; bake an extra 15 to 20 mins or until potatoes are tender & cheese is melted.
Step #18 Let stand 5 mins before serving to thicken sauce.