Place a medium wok or skillet on medium heat.
Add the 2 tablespoons of oil and wait until hot. Sprinkle in the whole cumin seeds until they start to sizzle.
Add the red chili. Stir for 30 seconds.
Add the chopped onion. Sauté for about 7 minutes until the onions start to turn golden.
Turn the heat low and add the turmeric and cumin powder. Give it a stir and quickly add the potatoes.
Stir till the potatoes are well coated with the spices.
Turn up the heat to medium-low. Add the chopped mung leaves and salt. Stir, then add about 2-3 tablespoons of water. Stir and cover.
Let it cook for about 5 minutes.
Uncover and check the potatoes. If undercooked, add another tablespoon or two of water and cook for another 3 minutes until the potatoes are almost done.
Uncover and cook for another 8 minutes until the potatoes are cooked. Most of the moisture should have evaporated by now. Drizzle with garlic oil.
Turn off the heat. Cover and let sit 5 minutes before serving.
Serve with dal and roti or rice.