01 - Heat a large skillet over medium-high heat. Brown the beef in batches to develop rich flavor, draining excess fat as needed. For ground beef, break apart while cooking until browned.
02 - Add the browned beef to a 6-quart slow cooker.
03 - Add diced onion, bell pepper, minced garlic, and jalapeño to the slow cooker.
04 - Pour in crushed tomatoes, diced tomatoes, and tomato paste. Add kidney beans, black beans, chili powder, cumin, smoked paprika, oregano, cayenne, salt, black pepper, and beef broth. Stir thoroughly to combine all spices and ingredients.
05 - Cover and cook on low setting for 6 to 8 hours, or on high for 4 hours. The beef should become very tender and flavors fully melded.
06 - Taste the chili and adjust salt, pepper, or cayenne as desired before serving.
07 - Serve hot, optionally topped with shredded cheddar cheese, sour cream, chopped cilantro, or sliced green onions.