Add the browned ground beef to the slow cooker along with the black beans, pinto beans, and corn.
Pour in the diced tomatoes, tomatoes with green chiles, and beef broth.
Add the diced onion, taco seasoning, ranch seasoning mix, and garlic powder, stirring well to combine all ingredients.
Cover and cook on low for 6 hours or on high for 3-4 hours until the flavors have melded together.
Stir well before serving and ladle into bowls.
Top with shredded cheese, sour cream, crushed tortilla chips, jalapeƱos, and cilantro as desired.