Separate the egg whites and yolks into two bowls.
In a microwave-safe bowl, melt cream cheese and sugar together until soft.
Whisk in the egg yolks and cornstarch until smooth.
In a separate bowl, beat egg whites until stiff peaks form.
Gently fold the egg whites into the cream cheese mixture.
Pour the batter into a greased and lined 6-inch springform pan.
Place 1/2 cup water in the Instant Pot. Set the trivet inside.
Cover the pan with foil and place it on the trivet.
Cook on High Pressure for 17 minutes and let naturally release for 15 minutes.
Cool completely before removing from pan and serving.