Heat 2-inch oil in a wide pan over medium heat. The pan must be wider than the papad to make sure they are flat after frying.
Once the oil is hot, hold papad with a tong and fry it from both sides until crispy.
Drain on a plate.
Fry all the 4 papad in the same manner and set them aside.
You can also roast the papad in a microwave, over direct flame, or in an air fryer.
Make The Topping
Mix onions, tomatoes, green chilies, cilantro, salt, chaat masala powder, Kashmiri red chili powder, and lime juice in a medium mixing bowl.
Do not add salt at this stage if you are planning to keep the topping for some time. The salt will make the veggies release their water and the topping will become watery. Add salt just before assembling the masala papad.
Top The Papad
Keep the papads on the serving platter without overlapping each other.
Top each papad with 2-3 tablespoon of topping and serve immediately.