Set the Instant Pot to sauté function, add olive oil, and heat.
3
Sauté onions in the Instant Pot for 4 minutes or until tender, then add garlic and cook for an additional 30 seconds until fragrant.
4
Press 'CANCEL/OFF' and add water, penne pasta, salt, crushed red pepper flakes, dried basil, and black pepper. Stir to combine, ensuring the onions and garlic are incorporated into the liquid.
5
Add 2 cups of spaghetti sauce on top of the pasta but DO NOT STIR.
6
Secure the lid, place the vent in the sealing position, and set to 'MANUAL' or 'PRESSURE COOK' mode on 'HIGH' pressure.
7
Adjust the cook time to 5 minutes. The Instant Pot will take an additional 5-8 minutes to come to pressure before the countdown begins.
8
When the Instant Pot beeps, quick release the pressure by flipping the valve to the venting position. Wait for the steam to release and the pin to drop.
9
Remove the lid, mix in the cream cheese and fresh baby spinach. Return the lid and allow the spinach to wilt for a minute.
10
Taste-test the noodles and adjust spices as needed.
11
Serve the pasta hot, topped with grated Parmesan cheese.