Take a bowl and add the paneer, capsicum and onion in it.
Add yogurt, ginger garlic paste, red chili powder, turmeric, garam masala, coriander powder, amchur powder, black pepper powder, salt, chat masala to the paneer cubes and mix well to fully coat the paneer with it.
Marinate this paneer cubes for at least 30 minutes or 2 hours in the refrigerator.
Heat a grill pan and place the paneer cubes, capsicum, and onion and drizzle some oil on it.
Grill till the paneer is browned on one side. Flip over the other side and cook till brown. Serve hot immediately.