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 minutes 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 minutes or until cheese is melted. If desired, garnish with sour cream, green bell pepper, tomato, and avocado.
Fun Fact: Carlsbad Caverns, in southeastern New Mexico, has been described as the 8th Wonder of the World. It contains 83 separate caves, including the nation's deepest limestone cave—1,597 feet—and third longest. The temperature is a constant 56 degrees. Besides the beauty of the glistening formations in the cave chambers, there are spirals of bats that exit the cave nightly from May through October.
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