In your Instant Pot, combine macaroni noodles, broth, butter, garlic powder, Dijon mustard, and salt. Mix well.
Ensure the pressure valve is set to seal, then close the lid and cook on high pressure for 5 minutes.
Once the time is up, quick-release the pressure by turning the pressure valve to vent. Be cautious, as the steam is hot!
Remove the Instant Pot lid and give the noodles a quick stir. Add cheddar cheese, cottage cheese, Greek yogurt, and heavy cream. Stir continuously until all the cheese has melted. It may take a bit of time for the cottage cheese to melt.
Serve your mouthwatering mac and cheese from the Instant Pot and sprinkle with freshly ground black pepper for an extra kick.