Heat oven to 400°. Spray 9 inch glass pie plate with cooking spray. In a 10-inch skillet, cook beef and onion over medium heat 8-10 minutes, stirring occasionally, until beef is brown; drain. Stir in salt. Spread in pie plate. Sprinkle with cheese. In a small bowl, stir remaining ingredients with fork or wire whisk until blended. Pour into pie plate. Bake about 25 minutes or until knife inserted in center comes out clean. |