We need two mixture.

First- mix mash potato with grated carrot, grated cabbage, fine chopped spinach, chopped green chilli and salt. Mix it. Add pinch of chat masala. At the time of making balls add bread slices and mix them withit.

Second- grate cheese in bowl, add red chilli flakes, black pepper and pinch of salt in it. Mix it and spread it in flat plateand freeze it for 10 mins or more.

Now make small cubes of those frozen cheese and hide it in potato mixture. Gently round it down, coat it with dry corn flour and deep fry it. Make sure potato has covered cheese completely else cheese will burst open. Serve it with salad or just ketchup or chutney.