01 - Set the Instant Pot to Sauté mode and add olive oil. Once hot, add diced onion, sliced carrots, and sliced celery. Sauté for 3-4 minutes until vegetables begin to soften.
02 - Stir in minced garlic and cook for 1 minute until fragrant, being careful not to burn it.
03 - Pour in vegetable broth, then add dried Italian herbs, salt, black pepper, and red pepper flakes. Stir well to combine, scraping up any browned bits from the bottom of the pot.
04 - Add the refrigerated cheese tortellini to the pot. Secure the lid and set the steam valve to Sealing position. Cook on Manual or Pressure Cook mode for 2 minutes at high pressure.
05 - Perform a quick pressure release carefully by moving the valve to Venting. Once all pressure has released, open the lid.
06 - Stir in heavy cream, chopped spinach, and grated Parmesan cheese until well combined and spinach begins to wilt.
07 - Let the soup rest on Keep Warm mode for 2-3 minutes to allow flavors to meld and spinach to fully wilt. Taste and adjust salt, pepper, or red pepper flakes as desired. Serve hot while creamy and thick.