Chicken Shawarma Meatballs in Tomato Sauce

Name: Chicken Shawarma Meatballs in Tomato Sauce
Cuisine: Middle Eastern
Ingredients: 1 teaspoon cumin; 1 teaspoon coriander; 1/2 teaspoon garlic powder; 1/2 teaspoon cinnamon; 1/2 teaspoon turmeric; 1/2 teaspoon salt; 1/2 teaspoon black pepper; Optional: pinch cayenne pepper; 1 pound chicken breast (ground); 1 onion (peeled and small diced); 2 cloves garlic (peeled and minced); 1 egg; 2 teaspoons shawarma spice (recipe below); 1/4 teaspoon salt; 1/4 cup parsley (chopped); 1/4 cup breadcrumbs; 2 tablespoon olive oil (divided); 1 small onion (peeled and finely diced); 1 tablespoon all-purpose flour; 6 ounces tomato paste; 2 cups chicken stock; 1/2 cup whole milk (or full-fat plain yogurt); 1 teaspoon shawarma spice (recipe below); 2 tablespoons parsley (chopped); 1/4 cup feta cheese (crumbled); Salt to taste; Garnish: chopped parsley