Taco Soup with Black Beans

My kids used to NEVER eat soup, one day we were at the store and they had a sample of this and they ATE IT! So we made it and they ate it at home and I think that started them on eating other types of soup. It has a little different twist from the normal taco soup but it's good.

Taco Soup with Black Beans
1 lbs. ground beef, browned and drained
15 oz. can black beans, drained
15 1/2 oz. can red kidney beans, drained
28 oz. can crushed tomatoes
12 1/4 oz. can corn, undrained
1 packet ranch dressing mix
1 packet taco seasoning
1 small onion, chopped

Combine all ingredients in a crock pot. Cover and cook on low 4-6 hours. Serve with shredded cheese, sour cream, and corn chips.