Mix all the ingredients for the marinade together in a large bowl.
Toss the paneer cubes, onions and peppers and mix to coat well.
Chill for at least 20 mins in the refrigerator.
Preheat the grill. Skewer the paneer and the veggies alternatingly.
Spray a non-stick grill pan with cooking spray and place the skewers on it.
Turn them around every 5-10 mins or so and they will be done once you dont see any raw marinade on them.
Sprinkle some minced cilantro and chat masala and squeeze a lime wedge just before serving.
Notes
The cooking spray is so that the paneer and veggies dont stick to the pan or the grill as they dont have any inherent fat in them to help with not sticking.