Chop vegetables in equal size (approximately) and preferably smaller bite sized.
Heat oil in a pan. add cumin seeds and let them crackle completely.
Add hing or asafoetida. Put chopped garlic to the pan and saute till light brown. Add chopped onion, green onions and saute till translucent.
Add chopped vegetables to the pan. Add ½ tsp salt and cover with a lid. Don't add water to it. Veggies will get cooked in steam only. Stir occasionally. Keep the flame medium to low flame.
It will take 5 minutes to get the vegetables cooked properly. Don't overcook them as it will make the dish mushy.
Add coriander powder, cumin powder, red chili powder, and turmeric powder, and give it a quick stir.
Cover with lid and again cook for 2 - 4 minutes on low flame. Check with a spoon if the potatoes are cooked or not. Cook till vegetables are just cooked (al-dente)and with a crunch.
Increase the flame and cook them for another 1 minute with continuously stirring. Add chopped coriander leaves and serve hot