Heat a large skillet over medium-high heat and stir in ground meat. Cook and stir until meat is crumbly, evenly browned, and no longer pink, about 7 mins. Drain and discard any excess grease.

Combine meat, kidney beans, chili beans, diced tomatoes, tomato sauce, onions, bell pepper, garlic, chili powder, cayenne pepper, salt, and black pepper in a slow cooker.

Cover and cook on LOW for 10 hrs.