Select the SAUTE mode.Once its hot and smoky, add oil.Let the oil become hot for 10 seconds.
Add the marinated chicken thighs, one piece at a time.Wring the excess marinade while adding it.
Do not move or disturb for 4-5 minutes.Flip and cook the other for side 1 minute.
Repeat the process till all the chicken is charred.This step can be done in a skillet on stove top too.
Add 1 tablespoon butter and 1 teaspoon oil.
Add Onions and saute.Add ginger Garlic.Cook till translucent for 1-2 minutes.
Add the tomatoes and tomato puree.Deglaze the instant pot with a silicon or wooden spatula.See the video for more information ,also read the notes*.
Add Ground chilli and Coriander powder.
Add ½ cup of water along with the charred chicken.
Close the pressure cooker and pressure cook for 3 minutes.
Open switch to saute.Add heavy Cream and fenugreek leaves and bring the gravy to boil.
Serve hot with naans and rice.