Cut the tops off the peppers. Take the seeds and membranes out. Poke a few holes in the bottoms of the peppers with a fork to allow built up water to escape.
In a bowl, combine the ground beef with the remaining ingredients. Mix well to fully combine.
Stuff the mixture evenly into each pepper.
Pour 1 cup of water into the bottom of your Instant Pot and insert the trivet. Place the peppers upright on the trivet. Lock the lid and set the vent to sealing.
Set the Instant Pot to Pressure Cook for 10 minutes. Manually release the pressure.
Test the internal temperature of the peppers to make sure it reached 165 degrees F (74 degrees C).
Serve with fresh parsley or basil for garnish.
Notes
Poking a few holes in the bottom of the peppers allows the liquid that builds up inside to drain out.