Place 1½ cups water and a steamer rack or trivet in the Instant Pot Bowl.
Grease 4 (6-ounce) ramekins.
In a large bowl, beat the eggs and olive oil.
Sift the almond meal, salt, and 2½ teaspoons of dried oregano into the egg mixture. Whisk well.
Divide the batter between the 4 ramekins, then sprinkle the remaining oregano on top of the batter.
Secure the lid on the Instant Pot and move the vent knob to the sealed position. Select “Manual” and cook on high pressure for 12 minutes. Let the pressure release naturally for 5 minutes, then carefully open the vent to release the rest of the pressure quickly.
Remove the ramekins from the Instant Pot and when cool enough to touch, run a knife around the edges of the buns and slip them onto a serving dish. Serve warm or cold.