In a large mixing bowl, add in the hung curd. Whisk well to make it very smooth and lump free.
Next add in Kashmiri chilli powder, garam masala, coriander powder, cumin powder, dry roasted and crushed kasoori methi, tandoori masala, ginger garlic paste, 1/2 tsp chaat masala, mustard oil, lemon juice, roasted gram flour and salt to taste. Whisk well to form a smooth marinade.
Add in the paneer and veggies and mix well to coat it gently with the marinade. Cover with a cling wrap and let it marinate for about an hour.
If using wooden skewers, place them in water for about 30 minutes. Meanwhile, remove the paneer marinade and let it come to room temperature. Also, preheat the oven to 450 F. Skewer the paneer and the veggies alternately. Baste with little oil
Oven method: Transfer the skewers on to a tray, big enough that the skewers are not touching the base of the tray. Or you may also use a rack placed over the baking tray, doing this helps in even circulation of heat under the food. Bake the tikkas for about 15 minutes or until evenly browned on all sides, turning sides once, basting with more oil as required.
Stovetop method: Heat oil in a tawa or a griddle, add the prepared skewers, let it get a nice sear for about 2 minutes on medium heat, then flip and cook on all sides, till it is nicely grilled and charred from all sides.
Remove from the oven/griddle, and sprinkle chaat masala. Serve with some onion rings/sliced onions, lemon wedges, and coriander mint chutney.