Add the condensed milk, yogurt and mango puree to a bowl and mix well.
Pour the mixture on top of the crust (if using) or straight into a greased 6-inch or 7-inch cheesecake pan (with a removable bottom), then cover the pan with foil.
Add 2 cups water into the steel inner pot, then place the trivet/wire rack that came with your pressure cooker into the pot. Place the pan on top of the rack.
Secure the lid, close pressure valve, and cook for 30 minutes at high pressure.
Naturally release pressure for 20 minutes, then release any remaining pressure (do not leave the cheesecake sitting in the pot). Stick a toothpick into the cheesecake and if it comes out clean, it’s done. If it’s still wet, pressure cook the cake for another 2 minutes.
Allow the cheesecake to cool down on a wire rack. I find it easiest to unmold the cheesecake while slightly warm.
Put the cheesecake in the fridge to chill for 4-6 hours.
Pour some mango puree on top of the cake right before serving. It adds a nice pop of color!