Boil potatoes until tender. Mash together with skim milk and pepper until smooth; keep warm.
Preheat oven to 350° F. Heat a heavy, nonstick skillet, at least 10 inches in diameter, over medium-high heat add onion and cook until onions are traslucent, 4 to 5 minutes.
Add bell pepper, carrots, peas, tomato, parsley, chicken stock, salt, pepper and Worcestershire sauce.
Simmer, uncovered, 15 minutes. Dissolve cornstarch in water and stir into meat mixture. Spoon into an ungreased 10 x 10 x 2-inchor 9 x 11 x 2-inch baking dish. Spread mashed potatoes over the surface, using a fork for texture.
Bake 30 to 35 minutes, or until lightly browned.
Servings: