Taco Casserole

2 lbs. ground beef
1/2 lg. onion, chopped
1/4 c. taco seasoning
1 1/2 c. salsa
1 (4 oz.) can green chilies
1 (15 oz.) can corn, drained and rinsed
1 (15 oz.) can black beans, drained and rinsed
1 (8 oz.) pkg. Mexican blend shredded cheese

1. Preheat oven to 350 F.
2. Brown ground beef and onion. Add taco seasoning stirring for 1 min. Stir in salsa, green chilies, corn, and black beans.
3. Place mixture in casserole dish. Cover and bake for 45 min. Uncover and sprinkle with cheese. Leave uncovered and bake for 15 min. more.
4. Serve with tortilla chips and sour cream and/or guacamole.