Dice the chicken breast into 1-inch bite-sized cubes.
Heat the avocado oil in a large skillet over medium-high heat.
Add the chicken to the skillet and sear until golden brown on all sides, then remove and set aside.
In the same skillet, add the diced onion, minced garlic, and minced ginger, sautéing until the onion is translucent.
Stir in the garam masala, turmeric, cumin, chili powder, sea salt, and black pepper, toasting the spices for 1 minute until fragrant.
Pour in the tomato puree and bring to a gentle simmer for 5 minutes.
Stir in the full-fat coconut milk to create a rich, creamy sauce.
Return the chicken to the skillet and simmer for another 3-5 minutes until the chicken is cooked through.
Serve the chicken tikka masala over the warm cooked basmati rice and garnish with fresh cilantro.