In a small bowl, mix together the cumin, coriander, paprika, turmeric, cinnamon, garlic powder, onion powder, salt, black pepper, and cayenne pepper.
In a large bowl, coat the chicken thighs with olive oil and the spice mixture until evenly covered.
Place the seasoned chicken in the slow cooker. Add the minced garlic, lemon juice, and chicken broth.
Cover and cook on low for 6-8 hours or on high for 3-4 hours, until the chicken is tender and easily shredded.
Once cooked, shred the chicken with two forks and mix it with the juices in the slow cooker.
Serve warm with pita bread, rice, or in a salad, garnished with fresh herbs or yogurt if desired.