1. Heat oven to 400?. Spray 9-inch glass pie plate with cooking spray.
2. In 10-inch skillet, cook beef and onion over medium heat 8 to 10 minutes, stirring occasionally, until beef is brown, drain. Stir in salt and Nature's seasoning. Spread in pie plate. Sprikle with the cheese.
3. In small bowl, stir remaining ingredients with fork or wire whisk until blended. Pour into pie plate.
4. Bake about 25 minutes or until knige inserted in center comes out clean.
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