Mix together eggs, vegetables, cheese, half and half, salt and pepper and chopped cilantro if using. Divide amongst four 1/2 pint wide mouth jars or other containers. Place lids on top but do not tighten. Their purpose is to keep water out of the eggs.
Place 2 cups of water in your Instant Pot, and place a trivet in the pot.
Place the egg jars on the trivet.
Cook for 5 minutes at high pressure, and quickly release remaining pressure.
Top with remaining 1/2 cup of cheese, and either broil or place in air fryer for 2-3 minutes, until the cheese on top is melted and lightly browned.