Heat olive oil and add half of the diced pork in a single layer in pressure cooker.
Allow pork to cook for 1-2 minutes before stirring to endure a brown sear.
Give it a good stir and continue to cook 2-3 more minutes until pork is done (it’s tender, juicy, and safe to eat once it reaches an internal temperature of 145 degrees).
Remove pork to a platter and repeat with the rest of the pork. Set pork aside to rest while the pasta cooks.
Turn pressure cooker off.
Add pasta, water, pepper, salt, and butter and cook on manual function, high pressure for 5 minutes.
Do a quick release.
Remove lid and stir in milk and cheese.
Stir, continuously until cheese has melted completely.
Pour macaroni and cheese into a serving dish and sprinkle with half of the diced pork. Stir.
Top with remaining pork.
Notes
Alternatively, you can use your favorite macaroni and cheese recipe and add cooked pork to it in the end.