1Heat oven to 400°F. Spray 9-inch glass pie plate with cooking spray. In 10-inch skillet, cook beef and onion over medium heat, stirring occasionally, until beef is brown; drain. Stir in seasoning mix. Spoon into pie plate. Top with chiles.
2In small bowl, stir eggs, milk and Bisquick mix until blended. Pour into pie plate.
3Bake about 25 minutes. Top with cheese and tomato; bake 2 to 3 minutes longer or until cheese is melted. Let stand 5 minutes before serving. Serve with lettuce, salsa and sour cream.