This quiche is satisfying as is, but you can add ½ cup chopped ham, crumbled bacon, or sausage for a meaty variation, if you like. The base—eggs, milk, salt, and pepper—works for nearly any filling you can think of.
Fold a 20-inch-long sheet of aluminum foil in half lengthwise twice to create a 3-inch-wide strip. Center it underneath the soufflé dish to act as a sling for lifting the dish into and out of the Instant Pot. Pour 1 1/2cups water into the pot and add the trivet.