Creating Jamie Oliver Chicken Tikka Masala is straightforward. Follow these steps for a delicious outcome:

1. Marinate the Chicken: In a bowl, combine the chicken pieces, yogurt, and tikka masala paste. Cover and refrigerate for 1 to 2 hours (or overnight).
2. Heat Oil: In a large skillet or pan, heat the vegetable oil over medium heat.
3. Sauté Aromatics: Add the chopped onion and cook until golden brown, which should take around 5-7 minutes. Stir in the minced garlic, grated ginger, and chopped red chili (if using). Cook for another 2 minutes.
4. Add Tomatoes: Pour in the canned chopped tomatoes and bring to a simmer. Cook for about 10 minutes, letting the sauce thicken.
5. Incorporate Chicken: Add the marinated chicken to the pan and cook for approximately 10-15 minutes or until the chicken is thoroughly cooked and tender.
6. Add Coconut Milk: Stir in the coconut milk and garam masala. Simmer for an additional 5 minutes, allowing the flavors to meld.
7. Season: Taste and season with salt and pepper as needed.
8. Garnish: Once the Chicken Tikka Masala is ready, remove it from heat. Garnish with fresh coriander.