1Heat oven to 400°F. Grease 9-inch pie plate. Cook ground beef and onion in 10-inch skillet over medium heat, stirring occasionally, until beef is brown; drain. Stir in seasoning mix (dry). Spoon into pie plate; top with chilies.
2Stir milk, eggs and Bisquick mix until blended. Pour into pie plate.
3Bake about 25 minutes or until knife inserted in center comes out clean. Sprinkle with cheese. Bake 8 to 10 minutes longer. Cool 5 minutes. Serve with salsa and sour cream.