Combine the spice blend and set aside.
In your Instant Pot, turn the "saute" mode on and heat up oil followed by onion.
Fry onion until golden brown, then add tomatoes. You can either fry on "saute" mode until tomatoes break down or pressure cook on high for 2 minutes.
Once tomatoes, break down, add the spices and chicken on "Saute" mode and continue to stir until chicken changes color. The stirring will also help seal the chicken with the spices.
Add only ¼ cup of water to loosen the curry, give it a nice stir then pressure cook on "high" with the valve sealed for 5 minutes, then do quick release.
Now on saute mode, allow the excess water to evaporate if there is any. You will notice the oil separate as you continue to bhoon the karahi.
Once oil has separated, add in the beaten yogurt on "low" and let the curry simmer for 5-10 mins. Allow the oil to separate again at this point.
Garnish with coriander, green chilis and julienned ginger and serve with Naan!