2 lbs. long horn Cheddar, shredded
2 (15 oz.) cans pinto beans
1 lg. chopped onion
1 lg. container sour cream
1 lb. ground beef
2 cans enchilada sauce
1 can tomato sauce
1 lg. bag tortilla chips

Brown ground beef drain. Crush tortilla chips. Combine all ingredients except sour cream. Save aside 1/2 shredded cheese. Bake covered at 375 degrees for 1 hour. Remove cover, spread sour cream on top with remaining cheese. Bake uncovered another 15 minutes or until cheese melts.