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, cook until browned and crumbled.
02 - Add the browned beef to the slow cooker insert.
03 - Add diced onion, red 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, pepper, and beef broth. Stir thoroughly to combine all ingredients.
05 - Cover and cook on low setting for 6-8 hours or on high for 4 hours, until beef is very tender and flavors have fully melded together.
06 - Taste the chili and adjust salt, pepper, or spices as desired. Serve hot with your choice of toppings.