Melt chocolate and butter in microwave. Microwave for around 1 minute. Then Whisk together.
Sift in icing sugar and mix.
Add in eggs and mix again.
Add in flour and mix until just combined.
Butter/oil ramekins and pour batter in.
Open Instant Pot. Add in 1.5 cups of water, trivet and then place ramekins on top.
Close Instant Pot. Select Cake function or high pressure cooking for 11 minutes. For more oooey gooey lava then set for 10 minutes. For less lava, set for 12 minutes.
When done, quick release, plate and serve.