01 - Combine chicken pieces with yogurt, lemon juice, turmeric, and salt in a large bowl. Mix thoroughly to coat evenly. Let marinate for at least 15 minutes, or up to 2 hours for enhanced flavor penetration.
02 - Heat vegetable oil in a large skillet or Dutch oven over medium heat. Add finely chopped onions and sauté for 5–7 minutes until golden brown and softened.
03 - Add minced ginger, garlic, and chopped jalapeños to the skillet. Cook for 2–3 minutes, stirring constantly until fragrant and raw aromas dissipate.
04 - Stir in diced tomatoes and continue cooking for 4–5 minutes until softened and beginning to break down, creating a base for the sauce.
05 - Sprinkle coriander, cumin, garam masala, cinnamon, chili powder, and black pepper into the mixture. Stir well and cook for 1 minute to toast the spices and release their essential oils.
06 - Add marinated chicken pieces to the pot. Cook, stirring frequently, for 5 minutes until lightly browned on all sides.
07 - Pour in water or chicken broth, scraping up any browned bits from the bottom of the pan. Bring to a gentle simmer, cover, and cook for 15–20 minutes until chicken is fully cooked through and sauce has thickened to desired consistency.
08 - Taste the curry and adjust salt or heat level as needed. Garnish generously with chopped fresh cilantro and serve immediately alongside steamed basmati rice or warm naan bread.