Put 2 Tbsp olive oil into Instant Pot along with 1 Tbsp minced garlic.
Set Instant Pot to saute function for 3 minutes and push start.
Add in chicken and saute until cooked through. Power the instant pot off.
Remove the chicken from the pot and add in noodles. If you're using fettuccine noodles, be sure to break them apart so they do not cook together.
Add enough water to the pot to cover the noodles. Put cleaned, sliced mushrooms on top.
Put the Instant Pot lid on and set it to pressure cook, custom time for 5 minutes.
When the Instant Pot is done cooking, quick release the pressure. Open lid and drain excess water.
Add chicken and alfredo sauce back in.
