01 - Combine chicken with yogurt, lemon juice, turmeric, and salt in a large bowl. Mix thoroughly to coat all pieces. Marinate for 15 minutes up to 2 hours for deeper flavor penetration.
02 - Heat vegetable oil in a large skillet or Dutch oven over medium heat. Add chopped onions and sauté until golden and soft, approximately 5-7 minutes.
03 - Add minced ginger, garlic, and chopped jalapeños to the skillet. Cook for 2-3 minutes until fragrant, stirring constantly to prevent burning.
04 - Stir in diced tomatoes and cook for 4-5 minutes until softened and beginning to break down, forming a base for the sauce.
05 - Sprinkle coriander, cumin, garam masala, cinnamon, chili powder, and black pepper over the mixture. Stir well and cook for 1 minute to release essential oils and intensify flavors.
06 - Add marinated chicken pieces to the pot. Cook, stirring frequently, until lightly browned on all sides, about 5 minutes.
07 - Pour in water or broth, scraping up browned bits from the bottom. Bring to a gentle simmer, cover, and cook for 15-20 minutes until chicken is cooked through and sauce has thickened to desired consistency.
08 - Taste and adjust salt or heat level as needed. Garnish with chopped cilantro and serve hot accompanied by steamed rice or warm naan bread.