Start the instant pot in Saute mode and heat ghee/oil in it. Add cumin seeds. Add potatoes and salt. Saute for 3-4 mins so they slightly brown on the sides.
Add the spices and mix well with the potatoes. Then add water and stir it all up. Press Cancel and close lid with vent in sealing position. Change the instant pot setting to manual or pressure cook mode at high pressure for for 4 mins.
After the instant pot beeps, let the pressure release naturally for 10 minutes then release the pressure manually. Add dry mango powder and garam masala. Change to sauté mode to dry any remaining water. It will just take 1-2 minutes.
Garnish with chopped cilantro and sprinkle lime juice while serving.