taco soup

from my friend Cynthia J.
1 lb ground beef or ground turkey
1 onion, diced
1 package dry taco seasoning
1 package dry ranch salad dressing mix
1 cans pinto beans
1 can kidney beans
1 can black beans
1 can whole kernal corn
2 cans Rotel tomatoes with green chilis

Brown ground beef with onion and drain. Add remaining ingredients and simmer until hot. Serve with sour cream, cheese, and tortilla chips.