Set the Instant Pot to Sauté mode and heat the oil. Once hot, add cumin seeds and hing. Stir for about 30 seconds until fragrant.
Add the onions, green chilies, and garlic. Stir and cover with a lid for 2-3 minutes, stirring occasionally, until the onions soften.
Mix in the ginger, stirring for 20 seconds, then add tomatoes and coriander powder. Sauté for another 2 minutes until the tomatoes break down.
Add the potatoes and 2 cups of water, stirring well. Turn off Sauté mode.
Secure the lid, set the Instant Pot to Pressure Cook (Manual) on HIGH for 4 minutes, and ensure the valve is sealed.
Once the timer beeps, do a quick release, then open the lid carefully.
Stir in the peas and the remaining 3 cups of water. Turn on Sauté mode again and let it simmer for 5 minutes until the peas are cooked and the flavors meld.
The potatoes should be easily pierced with a fork. Turn off the Instant Pot.
Garnish with chopped cilantro and serve with warm rice or your choice of grain. Enjoy!