01 - Heat a large skillet over medium-high heat. Add beef cubes and brown on all sides, about 5 minutes. Transfer to slow cooker.
02 - In the same skillet, add oil if necessary. Cook onion, red bell pepper, and garlic until softened, approximately 3 to 4 minutes. Transfer to slow cooker.
03 - Add kidney beans, crushed tomatoes, tomato paste, chili powder, cumin, smoked paprika, oregano, cayenne pepper, salt, and black pepper to slow cooker. Pour in beef broth and stir to combine.
04 - Cover and cook on low for 6 to 8 hours or on high for 3 to 4 hours until beef is tender and flavors meld.
05 - Taste and adjust seasoning as needed. Serve hot with optional toppings such as shredded cheddar, sour cream, cilantro, and jalapeños.