Brown the ground beef with the minced onion and garlic powder. Drain.
To a 6 qt or larger slow cooker, add the browned ground beef, chopped bell pepper, drained and rinsed black beans, drained corn, 2 cans of diced tomatoes, and beef broth. Stir in the taco seasoning. Set on low and cook for 8 hours. Do NOT add sour cream at the start of the cooking cycle.
Just before serving, swirl in the sour cream into the soup.
Ladle soup into bowls. Top with crushed tortilla chips and cheese.
Serve Slow Cooker Creamy Taco Soup with veggies.