Place all ingredients EXCEPT the To finish ingredients, into an Instant Pot. Mixing the sauce well before you place the chicken on top of the sauce.
Close the cooker and set for 10 mins on high, and let it release pressure naturally for 10 minutes. After that, release all remaining pressure.
Open up the pot and remove the chicken carefully and set aside
Blend together all the ingredients, preferably using an immersion blender
It's best to let the sauce cool just a little before adding the butter and the cream.
Add the cut up butter, cream, cilantro, and garam masala and stir until well incorporated.
Cut the chicken in smaller pieces.
Add the chicken back in and heat through.
Serve over rice, or with Naan
DONE!