Heat oil in a pan over medium flame. When hot, add bay leaf, cloves, cinnamon stick, mustard seeds, and cumin. Saute until the seeds crackle.
Add chopped green chilies, onion, and curry leaves. Saute until the onions turn soft.
Add turmeric powder and drumstick pieces. Saute for 5 minutes.
Next, add ginger-garlic paste and saute until the raw smell goes away.
Turn the flame to low and add salt and red chili powder. Mix well.
Add milk and water. Give a good mix.
Cover the pan and simmer on low flame for 10-15 minutes or until the drumstick pieces are cooked completely.
Lastly, add coriander leaves and mix.
Drumstick curry with milk is ready. Serve hot with rice or Indian flatbread.