In a heatproof bowl, combine chocolate chips and butter. Microwave in 10-15 second intervals until completely melted.
Add powdered sugar and combine until smooth.
Add two eggs, and beat until completely combined.
Add vanilla, flour, and cocoa powder.
Divide the batter between two or three greased ramekins.
Place the trivet in the Instant Pot, along with 1 cup of water. Carefully place your ramekins on the trivet. Put the lid on the pot, and set on Manual High or Pressure Cook for 8 minutes, with a 5 minute natural pressure release.
When the 5 minute natural pressure release is up, do a quick pressure release. Take the ramekins out of the pot with a pair of tongs and let stand for 5 minutes, then turn over onto a plate.
If there is too much liquid on top, dab it off with a paper towel.
Serve with ice cream, berries, powdered sugar, or as is.