In a large bowl, combine the chicken, yogurt, mustard seed oil, lemon juice, garlic, ginger, salt, coriander powder, cumin powder, garam masala powder, red chili powder, turmeric powder, and black pepper powder. Mix well until the chicken is evenly coated. Place a piece of hot coal in a small aluminium cup or foil in the center of the bowl. Drizzle a few drops of oil on the coal to create smoke. Quickly cover the bowl with a lid and let the smoke infuse the chicken for a few minutes. Remove the coal and let the chicken marinate for 1 hour.
Preheat the oven to 200°C (390°F).
Brush the grill rack or a baking tray with oil and arrange the marinated chicken pieces on it.
Scatter the sliced tomatoes and onions around the chicken.
Bake for about 25 minutes, flipping the chicken halfway through, until fully cooked and slightly charred.
Sprinkle with chaat masala and serve hot with naan, chutney, and salad. Enjoy! And remember “COOKING IS EASY!”