Chop the spinach. Add a 1/2 tablespoon of butter to the pot. When hot, add spinach and red peppers, sauté for 1 minute. Once done, set aside.
Whisk the eggs, cheese, heavy cream, onion powder, pepper, and salt in a bowl until combined.
Lightly spray silicone egg bite mold with non-stick cooking spray and spoon red pepper and spinach mixture into each cup.
Pour egg batter into each egg bite cup about 3/4 full. When all are full, use a spoon to mix the batter with the spinach and red peppers a little more.
Add 1 cup of water to the cleaned electric cooker pot, cover egg bite mold with the silicone lid, place on a trivet, and lower into pot. Close and lock the lid, set to high pressure for 8 minutes. When cooking is complete, let it naturally release for 10 minutes, then quick release the rest.
Carefully remove egg bite mold from the pot and remove the silicone lid. Let stand uncovered for 5-8 minutes to cool before removing from the mold and serving.