Pour the water into Instant Pot®. Place a wire trivet into the pot and arrange the eggs on top of trivet. Place the lid onto the pot and lock it into place to seal. Press the Egg or Manual/Pressure Cook setting, or cook on High Pressure for 8 minutes. Quick release the pressure. Peel the eggs while running them under cold water and then place them into in a bowl of very cold water to chill.
Cut the eggs in half lengthwise, then remove the yolks, placing them into a small bowl. Add the mayonnaise, oil, and mustard and mash together until very smooth. Season with salt and pepper. Fill the egg whites with the yolk mixture and top with desired garnishes. Chill until ready to serve.
Notes
Variations: Spicy Asian Style: Replace the oil with Sriracha sauce. Top with sesame seeds. California Style: Replace mayonnaise with mashed ripened avocado. Top with crumbled bacon. South of the Border Style: Replace oil with hot sauce, of choice. Top with a thin slice of jalapeño pepper.