Add the elbow pasta, butter, salt, and water in the Instant Pot. Do not stir the pasta, but gently use a spoon to make sure all pasta is covered with water. Dry pasta will not cook.
Cook on high pressure for 4 minutes, then carefully use the quick release.
Change to "saute mode" and add in the shredded cheddar cheese and milk.
Stir to combine until fully melted then remove from heat and enjoy!
Video
Notes
If releasing the pressure causes splatter, stop the release and try again in 10-15 seconds
To reheat, add a dab of butter on top then microwave in 30 second increments until warmed.
This nutrition information is based on the exact products I used in this recipe. Brands and sizes of products could alter exact nutrition and should always be calculated independently.