01 - Heat a skillet over medium heat. Add the ground beef and cook until browned, breaking it apart as it cooks. Drain any excess fat before proceeding.
02 - Add the diced onion, minced garlic, and diced red bell pepper to the skillet with the beef. Sauté for 2-3 minutes until vegetables are softened. Transfer the mixture to the crockpot.
03 - Add the drained corn, diced tomatoes with juices, green chilies, rinsed black beans, and rinsed kidney beans to the crockpot with the beef mixture.
04 - Pour in the beef broth. Sprinkle the taco seasoning, ground cumin, black pepper, and salt evenly over all ingredients. Stir thoroughly to incorporate the seasonings throughout.
05 - Cover the crockpot with its lid. Cook on Low setting for 6-7 hours or on High setting for 3-4 hours until flavors have melded and vegetables are tender.
06 - Remove the lid and taste the soup. Add additional salt, cumin, or taco seasoning as desired to achieve your preferred flavor profile.
07 - Ladle the hot soup into bowls and offer optional toppings such as shredded cheese, sour cream, chopped cilantro, sliced jalapeños, or crushed tortilla chips on the side.