Take oil in a pan turn heat low add onion paste,ginger,garlic paste,salt,red chilli powder,turmeric powder,coriander powder simmer for 20 minutes or till you feel oil is getting separate.

(if you want you can fry chicken separate for 10 minutes)optional it will enhance chicken taste

Now add chicken and yoghurt in a paste keep heat low cover the lid up and cook till you feel chicken is tender half now add potatoes simmer for 15 minutes add water as your desired thick ness.

Now when chicken and potatoes both get tender perfectly sprinkle garam masala powder cook in low flame max 5 minutes.

Now garnish with coriander leaves and green chillies.Serve with attached boiled rice,salad and stuffed chillies.