This is a great dish for a rainy day!
Turn the instant pot to the saute setting. Add your ghee or butter and the onions, garlic, and ginger and saute for 2 minutes, until they start to soften.
Add the garam masala, turmeric, and salt. Stir in and then add the tomato paste.
Add the chicken, the jar of tikka masala, sugar, and water. Stir in until all is combined, then secure the lid, and set the instant pot to 11 minutes.
When the instant pot says its done, allow the pressure to release naturally for about 10 minutes (or you can release if you're in a hurry).
Remove the lid after the pressure has released, and stir in your heavy cream. You can also stir in the Greek yogurt, or you can wait and add it to taste individually. Serve with rice and enjoy!