01 - Heat a large skillet over medium-high heat. Add beef cubes and sear until browned on all sides, about 5 minutes. Transfer to slow cooker.
02 - In the same skillet, add oil if necessary. Sauté onion, red bell pepper, and garlic for 3 to 4 minutes until softened. 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 melded.
05 - Taste and adjust seasoning as desired. Serve hot with optional cheddar cheese, sour cream, cilantro, and sliced jalapeños.