In a bowl, whisk the eggs, milk, and salt.
Grease with olive oil a baking dish, and pour the egg mixture.
Pour the water into the inner pot of your Instant Pot, and insert the trivet or steamer basket.
Place the baking dish on the top of the trivet.
Lock lid into place and set on the MANUAL setting for 5 minutes.
Use Quick Release - turn the valve from sealing to venting to release the pressure.
Once all of the pressure releases the steam will no longer come out of the vent and you’ll be able to open the lid.
Transfer cake on a serving platter and serve immediately.