Place the ground beef in a medium skillet over high heat and brown, stirring, until no longer pink. Spoon it into your slow cooker, including the fat. Now place the green bell pepper, onion, carrots and tomatoes into the slow cooker. Stir all the ingredients well, then add the remaining spices and seasonings. Stir once more, cover and cook on low for 8 hours, or high for 5 hours. Top with dairy-free sour cream if desired, additional diced onions or jalapenos.