Brown the ground beef in a large skillet over medium-high heat, stirring frequently to break it up into small pieces. Drain off any excess fat and transfer the beef to the slow cooker.
Add the chopped onion, green bell pepper, green chilis, chili beans (or black beans), tomato sauce, diced tomatoes, chili powder, cumin, smoked paprika, salt, and pepper to the slow cooker. Stir well to combine.
Cover the slow cooker and cook on low for 6-8 hours, or on high for 3-4 hours, until the vegetables are tender and the flavors have melded together.
About 30 minutes before serving, add the frozen corn.
Serve hot, garnished with a dollop of sour cream and a sprinkle of shredded cheddar cheese. Pair with corn bread or corn chips for a delicious and satisfying meal.