For preparing mushroom masala, wash the sliced mushrooms in luke warm salt water.
Cook it in a steamer for 5 minutes.
Fry onion, ginger and garlic in oil. Then add chilly powder, garam masala, turmeric powder, pepper powder and coriander powder. Mix well.
Add in tomato, mushrooms, salt and corn flour. Mix it well. Allow it to cook for 5 minutes with a closed lid. Remove from the flame.
Garnish with coriander leaves.
Mushroom masala is ready. Serve hot.