Tex-Mex Soup

1 lb. Ground beef 1 large onion, chopped 1 pkg. Dry Ranch dressing mix 1 pkg. Taco seasoning 1 can black beans 1 can pinto beans 2 cans diced tomatoes 1 can Rotel tomatoes 2 cans niblet corn Brown beef with onion. Drain off excess grease. Mix all ingredients together (do not drain beans or corn). Cook in slow cooker on high 2-3 hours or low 5-6 hours. Brought by Sandra Rhodes