Peel and cut potatoes into 2.5cm cubes. Add 2 tablespoons or water, cover and cook for 10 - 15 minutes on HIGH or until tender. Drain. Mash potatoes; add butter, milk, salt and pepper.
In a large bowl, combine mince and onion and cook for 8 minutes on MEDIUM HIGH, stirring every 2 minutes. Drain juices from meat. Add gravy powder, tomato sauce, Worcestershire sauce, tomato and parsley. Mix well.
Spoon mixture into a 25cm X 20cm rectangular dish. Spread mashed potato evenly over top of mixture. Brush with beaten egg. Cook for 20 minutes on MEDIUM HIGH; stand for 10 minutes before serving. Also add peas and carrots if desired.
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