Taco Casserole

1 lb ground beef
1 pkg taco seasoning
2 tsp taco sauce
1/2 tsp salt
Pepper
1/2 cup ketchup
1/2 pkg tortilla chips
1/2 lb cheddar cheese

Brown ground beef, then add 1 packet taco seasoning, taco sauce, salt, pepper, and ketchup.  Mix well.  Crush slightly the tortilla chips.  Grate the cheese.  Toss together in a casserole dish the beef mixture, tortilla chips, and 2/3 of the cheese, sprinkling the remaining 1/3 cheese on top.  Heat casserole at 350 degrees for 10 minutes, or until cheese is melted.