Cut chicken breast into 1-inch cubes.
In a medium-sized bowl add Greek yogurt, 1 tablespoon garam masala, 1 teaspoon turmeric, ground ginger, ground garlic, and lemon juice.
Whisk to combine and stir in chicken. Cover with plastic wrap and let marinate in the refrigerator for at least 1 hour or up to 24 hours.
When you're ready to make the chicken add oil to your Instant Pot and press the sauté button.
When the oil is hot add the chicken in batches and brown. Add your browned meat to a plate and add more oil between batches if necessary.
Add the chicken back to the Instant Pot and add in the tomato sauce, kosher salt, cayenne pepper, and remaining garam masala and turmeric. Stir to combine.
Secure the lid, make sure the nozzle is placed to "seal" and cook on the high manual setting for 10 minutes. The Instant Pot will take about 10 minutes to reach pressure.
When the cooking time is over manually release the pressure and remove the lid when unlocked.
Gently stir to combine, turn the Instant Pot back on to sauté mode, and pour in the coconut milk.
Simmer for about 10 minutes or until the mixture has thickened.
Turn off the Instant Pot and stir in the frozen peas and let them warm in the sauce, about 5 minutes.
Serve over rice with a sprinkle of cilantro.