01 - Heat the olive oil in a large skillet over medium-high heat. Add the beef cubes and brown on all sides for approximately 5 minutes. Transfer the browned beef to the slow cooker.
02 - In the same skillet, add the diced onion, bell pepper, and jalapeño. Sauté for 3–4 minutes until just softened. Add the minced garlic and cook for 1 minute more. Transfer the sautéed vegetables to the slow cooker.
03 - Add the kidney beans, crushed tomatoes, beef broth, chili powder, cumin, smoked paprika, oregano, black pepper, salt, and cayenne pepper to the slow cooker. Stir everything thoroughly to combine the spices and liquids with the meat and vegetables.
04 - Cover the slow cooker and cook on LOW setting for 6–7 hours or on HIGH setting for 3–4 hours. The beef should be tender and the flavors well developed.
05 - Taste the chili and adjust the seasoning with salt or spices if needed. Serve hot, garnished with chopped cilantro, shredded cheese, sour cream, or sliced green onions if desired.