Slow Cooker Chicken Shawarma

Ingredients

• 2 pounds boneless, skinless chicken thighs
• 3 tablespoons olive oil
• 4 cloves garlic, minced
• 2 teaspoons ground cumin
• 2 teaspoons ground coriander
• 1 tablespoon ground paprika
• 1 teaspoon ground turmeric
• 1 teaspoon ground cinnamon
• 1 teaspoon salt
• 1 teaspoon black pepper
• 1 teaspoon cayenne pepper (optional for heat)
• 1 lemon, juiced
• 1 large onion, thinly sliced