Heat oven to 400 degrees. Cook beef and onion in ovenproof 10-inch skillet over medium heat, stirring occasionally, until beef is brown; drain. Stir in taco sauce. Sprinkle with cheese. Stir remaining ingredients until blended. Pour over beef mixture. Bake about 30 minutes or until golden brown. You can add sour cream, chopped lettuce and tomatoes for toppings.
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