Heat oil in a wok and add chopped onions and saute till translucent
Put all chopped vegetables and saute on high flame for 3-4 mins
Add salt and turmeric powder and cover and cook on low flame.
After 4-5 mins when veggies are soft,add chopped tomato, coriander powder and red chilli powder.
Cover and cook for 1-2 mins
Add garam masala powder and chaat masala and serve hot.