Combine ground Beef, cornflakes, garlic powder, Onion, and egg; mix well. Add salt and pepper. Place Beef mixture to 9" pie pan. Pat to cover bottom and sides evenly. Heat water, skim milk, and salt just to a boil; remove from heat. Bake 425 °F for 30 minutes; drain off excess fat. Heat water, skim milk, and salt just to a boil; remove from heat. Add potato granules; mix thoroughly. Add margarine; blend well. Cover and allow to stand 5 minutes, or until potatoes thicken. Spread evenly over meat mixture. Return to oven and bake until potatoes are golden brown. Allow to rest 10 minutes before cutting pie into wedges. Micowave: cover Beef mixture. Cook on medium for 10 to 12 minutes; drain. Cover with potatoes. Cook on medium for 2 minutes. Hold 5 minutes. Food exchanges per serving: 4 high-f