Place the pickling spice in the center of a piece of cheesecloth or a coffee filter. Tie tightly with a long piece of string.
Layer onion and chicken in slow cooker. Mix flour, garlic salt and turmeric. Sprinkle over chicken. Add pickling spice bundle, broth, tomatoes, dates and almonds to slow cooker. Cover.
Cook 4 hours on HIGH or 8 hours on LOW. Remove pickling spice bundle. Serve with hot cooked couscous, if desired.