Place instant pot setting to “sauté”. Then add in 1 tablespoon olive oil. Next, place the Italian sausage in the Instant Pot and cook for 5 minutes. Make sure to turn 1 to 2 times until brown on both sides. Then added the whole garlic cloves and white onion and sauté for an additional 5 minutes into onions begin to become translucent and color.
De-glaze the pot with a half cup of water. Use a wooden spoon to break up the brown bits on the bottom of the pot.
Turn the Instant Pot off. Place the lid on the Instant Pot making sure the valve is set to “sealing“. Select the “meat” setting for 10 minutes. It will take the Instant Pot roughly 10 minutes to come to pressure before the timer begins.
Once the sausage is done carefully, force the pressure by releasing the pressure valve using a pot holder and a dish cloth.
Remove the lid from the Instant Pot. Mix well and divide evenly among plates.
Note: you can leave the sausage in the Instant Pot on the “keep warm“ setting until ready to serve. Any leftover Italian sausage should be stored in the air tight container in the refrigerator for up to 3 days.