First, start by cutting the chicken breasts into 1 inch cubes. Transfer them to a bowl and season with dry red wine, salt, ground black pepper, granulated garlic and crushed red pepper flakes. Set aside for later.
Next, chop and dice the onion, green pepper and garlic cloves.
Set your Instant Pot to the saute function. Add in olive oil and once it has heated up, add in the chopped green peppers and onion. Saute for 2-3 minutes or until the onions are soft and translucent.
Next, add in the minced garlic cloves and saute for 30 seconds.
Immediately cancel the saute function and add in the tomato sauce and water. Give everything a quick stir. Add more salt to taste.
Next, add in the cubed chicken breasts. Break the spaghetti in half so it fits in the Instant Pot and add it in as well. Do not stir!
Close the Instant Pot lid and cook on high pressure for 8 minutes. Once the 8 minutes are up, engage the quick release button. You’ll know all the pressure has released once the pin drops.
Next, remove the lid and give everything a quick stir. Place the lid back on the Instant Pot (no need to lock it in place, simply cover) and let it sit for 5 minutes. This will allow the sauce to thicken up well.
Finally, open the lid and stir again. Garnish with parmesan cheese and fresh parsley, if desired, and enjoy!