Make the chicken marinade by adding the Greek yogurt, salt, pepper, spices, ginger, garlic, lemon juice, and neutral oil to a large bowl. Mix to form a well combined thick paste.
Cut the chicken into 1-inch (2.5 cm) chunks and add them to the bowl of marinade. Toss to fully coat the chicken.
Cover the bowl with plastic wrap and marinate in the fridge for at least 1 hour or up to 48 hours. The longer it marinates, the better.
For the raita, combine all the ingredients in a bowl and set aside in the fridge while you cook the chicken.
Preheat the oven to 450°F (235°C) and line a large baking sheet with foil.
Remove the chicken from the fridge and thread the pieces onto 4 metal skewers. We usually get about 10-15 pieces of chicken per skewer.
Place the chicken skewers on the prepared baking sheet and bake for 10 minutes. Flip the skewers over and cook for another 10 minutes.
Turn on the broiler and cook for 3-4 minutes on both sides until lightly charred (a total of 6-8 minutes of broiling). Keep an eye on it so the chicken doesn't burn.
Heat up your naan and spread some of the raita on top. Add one skewer's worth of chicken to each naan and top with thinly sliced red onions, chopped cilantro, and more raita.