Take 2 tbspn oil in pressure cooker and add whole garam masala mention above.
Add 1 medium thinly sliced onion and cook until tansculent, add 1 tbspn ginger garlic paste and sauté until brown. Add curry leaves.
Add all the spices mentioned above and sauté untile oil oozes out, add lilttle water if needed.
Add the potatoes, carrots and chicken and sauté for sometime.
Cover the lid and cook for one whistle with 4 glass water
Release the pressure, and add coconut milk/coconut milk powder slurry and cook for ten minutes
Add fresh coriander, mint leaves and green chillies and summer for 15 minutes.
Add black pepper and garam masala at last.
Ready to serve with roti/naam/khuboos/bread/appam
You can add little cornflour slurry or mash some potatoes to thicken the stew
Quick video for reference