Cut cauliflower and potato into medium sized cubes and thoroughly wash it. Heat oil in a frying pan. Add green chilli, ginger garlic and stir for few seconds. Add chopped onions and fry over medium heat until light golden brown. Add chopped tomato and green peas. Cook until tender. Add red chilli powder, cumin powder, turmeric powder, dry coriander powder, garam masala and salt. Mix well. Add cauliflower and potato and stir. Saute for 5 minutes. Cover the pan and cook over medium heat until tender.