Chicken Marinade: – Boneless, skinless chicken breasts  – Plain yogurt – Ginger  – Garlic – Ground cumin – Garam masala – Turmeric – Salt – Chili powder – Olive oil Sauce: – Ghee or unsalted butter – Onion  – Garlic – Ginger  – Crushed tomatoes – Garam masala – Ground cumin – Chili powder – Heavy cream – Sugar – Coriander leaves – salt to taste