Rinse lentils and pick through them and discard any debris.
Add the olive oil to the Instant Pot and press the SAUTE button. Change the heat to custom and adjust to MEDIUM heat. When the display reads "HOT add the onion, celery, and carrots. Cook for 10 minutes, stirring occasionally to keep the onions from sticking. When the onions are softened, add the minced garlic and heat for about 30 seconds. Press CANCEL on the Instant Pot.
Stir in the lentils, water, chicken bouillon, and Italian seasoning. Put the lid on and lock it into place. Make sure the vent is sealed.
Press PRESSURE COOK. Select HIGH and adjust the time to 12 minutes.
Allow the steam pressure to naturally release for 10 minutes. Manually release any remaining pressure. Unlock and remove the lid.
Salt and pepper to taste.
Garnish with grated Parmesan cheese and Serve.