Turn the pressure cooker to sauté mode. Add 2 tbsp butter. Once melted, add the 1 diced onion, 4 cloves minced garlic, and 1 tbsp grated fresh ginger. Sauté for 3 minutes until softened.
Stir in the 1 tbsp garam masala, 1 tsp ground turmeric, 1 tsp ground cumin, 1 tsp chili powder, and 1 tsp salt. Cook for 1 minute until fragrant.
Pour in the 14 oz crushed tomatoes. Scrape the bottom of the pot to remove any browned bits.
Add the 1.5 lbs chicken pieces. Stir to coat the chicken in the tomato sauce.
Secure the lid and close the pressure valve. Select 'Manual' or 'Pressure Cook' on High for 6 minutes.
Once the timer finishes, perform a quick pressure release (QR). Carefully open the lid.
Stir in the 0.5 cup heavy cream. Let the curry rest for 5 minutes to thicken.
Garnish with 0.25 cup fresh chopped cilantro and serve over the cooked basmati rice.