In a large bowl, combine the yogurt, lemon juice, cumin, coriander, garam masala, turmeric, paprika, salt, and black pepper. Add the chicken pieces and mix well to coat. Cover and marinate in the refrigerator for at least 1 hour, or overnight for best flavor.
Heat the vegetable oil in a large skillet over medium heat. Add the chopped onion and sauté until soft and translucent, about 5-7 minutes.
Stir in the minced garlic and ginger, cooking for an additional 1-2 minutes until fragrant.
Add the marinated chicken to the skillet, cooking until browned on all sides, about 5-7 minutes.
Pour in the crushed tomatoes and bring the mixture to a simmer. Reduce the heat to low and let it cook for 15 minutes, stirring occasionally.
Stir in the heavy cream and simmer for another 10 minutes, allowing the sauce to thicken. Adjust seasoning to taste.
Serve hot, garnished with fresh cilantro, over rice or with naan.