Yes, you can absolutely cook this vegan chili in the slow cooker or crock pot Start the process in the same way. Cook the celery, onions, bell pepper and garlic on "high" settings. When they are done, add all the other ingredients in it and let it cook on high for about 4-5 hours. You may have to play around with the time. The slow cooker size I would recommend is at least a 6 quart or more