Put the chicken, kosher salt, pepper, and garlic in the slow cooker. Mix the harissa, honey, soy sauce, lemon juice, cumin, and ground cinnamon in a small bowl and pour over the chicken. Set your slow cooker to low to 6 to 8 hours, stirring a few times.
Use two forks to shred the chicken into smaller pieces right in the slow cooker.
Serve chicken in warm mini naan or pita bread topped with feta, tzatziki, parsley, and lemon wedges to squeeze over top.
