In a small bowl, combine the cubed chicken breast with Greek yogurt and half of the garam masala, turmeric, and cumin; allow it to marinate for at least 15 minutes.
Heat the olive oil in a large skillet over medium heat and sauté the diced onion until it becomes translucent and soft.
Stir in the minced garlic and fresh ginger, cooking for about 1 minute until the mixture is highly fragrant.
Add the marinated chicken to the skillet and cook until browned on all sides, approximately 5-7 minutes.
Pour in the tomato puree and the remaining spices, then reduce heat and simmer for 10 minutes to let the flavors meld.
Stir in the full-fat coconut milk to achieve a creamy consistency and season the sauce with sea salt and black pepper.
In a separate small pan, lightly sauté the cauliflower rice over medium heat for 3-5 minutes until tender but not mushy.
Plate the cauliflower rice, top with the creamy chicken tikka masala, and garnish with chopped fresh cilantro.