Turn on the sauté function of the Instant Pot. Add oil and sauté onions, garlic, and ginger along with the spice blend for the curry. Stir continuously to prevent sticking.
After approximately 2 minutes, deglaze the inner pot by adding 2-3 tablespoons of water.
Add the marinated chicken, including the yogurt marinade, to the pot. Stir for another minute or two before adding the tomato sauce. Stir well to combine.
Turn off the saute function. Close the lid of the Instant Pot and ensure the valve is in the sealing position.
Set the Instant Pot to manual pressure cook mode and adjust the timer to 8 minutes.
Once the cooking cycle is complete, perform a quick pressure release.
Stir in the butter and heavy cream, and taste the sauce for seasoning. Adjust the seasoning as desired.
Turn on the sauté function again and sauté for approximately 5 minutes to reduce the sauce.
Serve the chicken tikka masala over rice and or with naan bread or other sides. Please refer to blog post for more options.