chaat masala (a dried spice mixture available from Asian grocers), to sprinkle
For the marinade, mix together all the marinade ingredients in a bowl and add the paneer, onion and peppers. Cover with cling film and allow the paneer and vegetables to marinate for 30-40 minutes, or longer, in the fridge.
Preheat the oven to 200C/400F/Gas 6 and oil a baking sheet.
Thread the vegetables and paneer alternately onto the skewers. Bake in the oven for seven minutes, drizzle over the melted butter, turn and cook for another 5-7 minutes or until charred at the edges.
Sprinkle with chaat masala and serve. They are also great served with a green chutney.