In your Instant Pot, add the chicken broth, heavy whipping cream, and garlic. Do not stir.
Use your hands to break the fettuccine noodles in half so that they can fit horizontally in the Instant Pot easily. Add the fettuccine noodles into the Instant pot, making sure that the noodles are submerged in the liquid.
Put the lid on your Instant Pot. Turn the pressure to MANUAL or HIGH and set the timer for 8 minutes. Once the cooking cycle has completed, allow for an 8 minute natural release, then a Quick release immediately after. Open the lid.
Add the grated parmesan cheese into the pot and use tongs to stir the sauce and the noodles. The sauce will be liquid-y and that is OKAY. Turn the pot to the KEEP WARM setting, and allow the noodles to sit for about 5 minutes or so, stirring occasionally. This will evaporate any extra liquid. Season to taste with salt, pepper, and parsley.
Once your sauce has reached your desired consistency, turn the pot off. Enjoy!
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