Put all the ingredients (Except the spinach,kale,salt and pepper) in the slow cooker give it a stir and cover. Set cooker to high and cook for 5-6 hours. About 15 minutes before serving add the spinach or kale (or both) salt and pepper. Remove bay leaves before serving. This is a fantastic make ahead meal. It is better the next day. It freezes well too. If the lentils thicken just add broth to desired consistency. Serve with a sandwich or it is a healthy meal on its own. Enjoy!