Wash the yard long beans and chop them into 1 inch pieces. Par-boil in sufficient water till tender. Drain the water and keep the barbati aside.
Wash and peel the potatoes. Cut them into long wedges and pressure cook with a 1/8 tsp of turmeric and sufficient water for just 1 whistle. Drain the water and keep the cooked potato wedges aside.
Heat oil in a wok or kadai. Add cumin seeds and allow to splutter.
Add sliced onions and slit green chilli. Sauté till the onions get some colour on them.
Add the barbati and sauté for a minute.
Sprinkle salt, turmeric, red chilli powder, coriander powder and garam masala powder. Mix well.
Add the cooked potatoes and gently combine everything together. Cover and cook on a low flame for 1-2 minutes.
Sprinkle roasted chickpea powder (putnala powder) on the bangaladumpa barbati kura and mix well.
Garnish with chopped coriander leaves and remove.
Serve Aloo Barbati Sabzi with rice or roti.