Crockpot Chicken Shawarma

Name: Crockpot Chicken Shawarma
Ingredients: 1 Tablespoon cumin; 1 Tablespoon garlic powder; 1 Tablespoon turmeric; 1 Tablespoon ground coriander; 1 Tablespoon paprika; 1 teaspoon cinnamon; 1/2 teaspoon cloves; 1/2 – 1 teaspoon cayenne; For the chicken:; 1.5 – 3 lb. chicken thighs; 1 1/2 cups nonfat plain yogurt; 1/2 cup chicken broth; 1/4 cup Shawarma spices; 1/2 teaspoon salt; Juice of 1 lemon; 2 Tablespoons olive oil; 1 onion, chopped into small pieces