Heat oven to 425. Grease 9-inch pie plate. Place mashed potatoes in a bowl; stir in egg and green onions. Spread and press potato mixture evenly against bottom and side of pie plate. Bake 20-25 min or until light brown. Cook ground beef and chopped onion in 10-inch skillet, stirring occasionally, until beef is brown; drain thoroughly. Stir in remaining ingredients except cheese. Cover and cook over low heat 5 minutes, stirring occasionally. Spoon into shell; sprinkle with cheese. Bake 2-3 min or until cheese is melted. If desire, garnish with sour cream, bell pepper, tomato and avocado
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