Combine ingredients for the tandoori masala (apart from the onions) in a food processor until smooth. Transfer it to a mixing bowl with the chicken pieces and sliced onion. Toss to combine. Then, cover and marinate in the fridge for 6 hours (but at least one hour).
Preheat a gas grill by setting all the burners to high heat for 10 minutes. Then, use a wooden grill scraper to clean the grates.
Hold a wide metal skewer with one hand and slide the chicken pieces onto it. Repeat with the remaining ingredients until all the skewers are loaded.
Set the skewers onto the grill and cook over high heat for 7 minutes. Tip: Avoid opening the grill and moving the chicken so the pieces develop a nice char.
Flip the chicken skewers and cook for 5 minutes. Check the temperature of the chicken, and continue cook until it reaches 165°F (73°C)
Remove the chicken from the grill and transfer it to a cutting board or serving dish to rest for 10 minutes.
Notes
Expert Tips:
I recommend marinating the chicken tikka for 6-24 hours (but at least one hour) to ensure the flavor penetrates and flavors the chicken.
Preheat the grill, letting it get hot before adding the chicken. Doing so locks in all the moisture as the chicken sears and develops a nice char, which is necessary for chicken breast, which is prone to drying out.
Carefully shake off the excess marinade and onions before setting them onto the grill.
Nutrition Disclosure:
The nutritional information shown is an estimate provided by an online nutrition calculator. It should not be considered a substitute for professional advice.