01 - Heat a skillet over medium heat. Add ground beef and cook until browned, breaking it apart with a wooden spoon. Drain excess fat and set aside.
02 - In the same skillet, add diced onion, minced garlic, and bell pepper. Sauté for 2-3 minutes until softened and fragrant. Transfer the beef and vegetable mixture to the crockpot.
03 - Add corn, diced tomatoes with juices, green chilies, black beans, and kidney beans to the crockpot. Pour in beef broth. Sprinkle taco seasoning, cumin, black pepper, and salt over all ingredients. Stir thoroughly to combine.
04 - Cover and cook on Low setting for 6-7 hours or on High setting for 3-4 hours, until flavors have melded and vegetables are tender.
05 - Taste the soup and adjust seasonings if needed. Ladle hot soup into bowls and serve with your choice of toppings such as shredded cheese, sour cream, cilantro, jalapeños, or tortilla chips.