In a bowl, combine the chicken breast, Greek yogurt, lemon juice, turmeric, and 0.5 tsp of garam masala to marinate for 20 minutes.
Heat the ghee in a large skillet over medium-high heat and sear the chicken until golden brown on all sides, then remove and set aside.
In the same skillet, add the diced yellow onion, minced ginger, and garlic, sautéing until the onions are translucent and aromatic.
Stir in the tomato puree, ground cumin, ground coriander, sea salt, black pepper, and the remaining 0.5 tsp of garam masala.
Return the chicken to the skillet, reduce heat to low, and simmer for 10 minutes until the sauce has thickened and the chicken is fully cooked.
Serve the chicken tikka masala over the cooked basmati rice and garnish with chopped fresh cilantro.