Impossibly Easy Taco Pie

1 lb ground beef
1 medium onion, chopped
1 pkg taco seasoning mix
1 (4oz) can chopped green chilies, drained
3/4 C original Bisquick
1 1/4 C milk
3 eggs
1 C shredded Colby-jack or cheddar cheese

Heat oven to 400. Grease pie plate, 10x1 1/2". Cook beef and onion in 10" skillet over medium heat, stirring occasionally, until beef is brown; drain. Stir in seasoning mix. Spread in pie plate. Sprinkle with chilies. Stir in Bisquick, milk, eggs until blended. Pour into pie plate. Bake 25 minutes. Sprinkle with cheese. Bake 8-10 minutes or until knife inserted in center comes out clean. Let stand 5 minutes before serving.