In a 4-quart Dutch oven or pot, brown the ground beef with the chopped onion, garlic, and green bell peppers
Mix in the crushed tomatoes, tomatoes with green chiles, pinto beans, black beans, and whole kernel corn
Add the beef broth, taco seasoning, ranch dressing mix, cumin, and coriander. Bring the soup to a boil, and simmer for 30 mins