Start by cutting the chicken breasts into bite-sized chunks. Finely chop the onion, and mince the garlic and ginger. Having everything prepped will make the cooking process smoother.
Plug in your Instant Pot and set it to the “Sauté” function. Add the unsalted butter and let it melt. Once melted, add the finely chopped onion. Sauté for about 3-4 minutes until the onion is translucent. Then, add the minced garlic and ginger, cooking for another minute until fragrant.
Stir in the garam masala, ground chili powder, ground cumin, ground turmeric, ground cayenne pepper, and 1 teaspoon of kosher salt. Cook the spices with the onion mixture for about a minute to release their flavors.
Add the bite-sized chicken chunks to the pot and stir well to coat them with the spice mixture. Cook for about 2-3 minutes until the chicken is lightly browned.
Pour in the tomato sauce and light coconut milk, stirring to combine. Make sure to scrape any bits stuck to the bottom of the pot to avoid the burn notice.
Close the lid of the Instant Pot, ensuring the valve is set to the sealing position. Select “Manual” or “Pressure Cook” and set the timer for 10 minutes.
Once the cooking time is complete, allow the pressure to naturally release for 5 minutes before performing a quick release for any remaining pressure. Carefully open the lid.
Add the frozen peas to the pot and stir. Finally, mix in the plain nonfat Greek yogurt until well combined and creamy.
Serve your Instant-Pot Chicken Tikka Masala over cooked brown rice or with naan bread, if desired. Garnish with fresh cilantro for a touch of color and flavor.