Cut chicken into cube sized pieces and marinate in yogurt, overnight, in the refrigerator. Heat the oil and add the cumin, onions, ginger, and garlic. Fry until onions are dark brown, being careful to not actually burn the onions.Add the jar of marinara sauce, turmeric, cumin, garam masala and the chicken tikka masala powder. Add salt to taste. Let the mixture cook for 20 - 25 mins. Add chicken pieces marinated in yogurt and cook for another 25 mins. Garnish with cilantro and serve. (Recipe #264)