Start by pouring 1 cup of water into the Instant Pot. Place the egg rack or steamer basket inside to hold the eggs above the water.
Place the 8 eggs on the rack or in the basket. You can stack them if necessary, but make sure they are stable.
Secure the lid on the Instant Pot and set it to pressure cook on high for 5 minutes. Once the time is up, let the pressure release naturally for 5 minutes before performing a quick release for any remaining pressure.
Carefully remove the eggs and place them in a bowl of ice water for about 5-10 minutes. This will help stop the cooking process and make peeling easier.
While the eggs are cooling, in a mixing bowl, combine the mayonnaise, Greek yogurt, dried mustard, paprika, and chopped celery. Mix well until smooth and creamy.
Once the eggs are cool enough to handle, peel them and place them in the bowl with the dressing. Use a fork or potato masher to mash the eggs to your desired consistency.
Gently fold the eggs into the dressing until all the ingredients are well combined. Taste and adjust seasoning if necessary.
For the best flavor, let the egg salad chill in the refrigerator for at least 30 minutes before serving.