Flash marinate the chicken cubes with crushed black pepper and salt and set aside.
Set the Instant Pot on SAUTE function & set it on NORMAL heat setting.
Add butter and when it melts add the minced garlic and saute for 30 seconds.
Now, add the chicken stock and de-glaze the pot well scraping the sides & the bottom of the pot with the help of a spatula to loosen any stuck up bits or crumbs. This will prevent the BURN error.
CANCEL the SAUTE. Add the Fettuccine Noodles (halved) in a bird nest or zig zag pattern. DO NOT dump them all at once, watch the video above. Gently press down the fettuccine with the spatula so that they are covered with the stock.
Now, layer the flash marinated chicken cubes on top of the fettuccine in a single layer. Gently press down the chicken cubes with the spatula so that they get a light coat with the liquid.
Next, close the lid of the Instant Pot. Seal the Valve and PRESSURE COOK on HIGH for 5 minutes.
Once the cooking cycle is over the Instant Pot will begin to beep. Wait for 10 minutes Natural Pressure Release (NPR) than release the rest of the pressure manually by moving the valve from the SEALING to the VENTING position. Open the lid carefully once the floating metal pin drops.
You'll have cooked fettuccine in a puddle of liquid. That's what we want, the extra liquid will be nicely absorbed by the cheese & create a creamy alfredo sauce.
Hit the SAUTE function and keep it on LOW heat settings. De-tangle the cooked fettuccine by stirring with a spatula or a pair of forks.
Now, add the warm cream and mix well.
Add the cream cheese (room temperature), dice into cubes if you can, it helps to blend the cheese fast with the pasta. Mix well until the cream cheese fully incorporates and there are absolutely no lumps.
At this stage you may Turn off the Instant Pot. Now, add the parmesan cheese in 2-3 slots mix well until the cheese fully incorporates and melts.
You'll have an extremely creamy alfredo sauce. Add the steamed or blanched broccoli florets (fresh or frozen). Give everything a good mix and serve right away. Enjoy!