01 - Set the Instant Pot to Sauté mode. Add olive oil and heat until shimmering. Add diced onion, sliced carrots, and 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, 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 refrigerated cheese tortellini to the pot. Secure the lid and set the steam valve to Sealing position. Cook on Manual or Pressure Cook setting for 2 minutes at high pressure.
05 - Perform a quick release by carefully moving the steam valve to Venting. Wait until the float valve drops and all pressure has released before opening the lid.
06 - Stir in heavy cream, chopped spinach, and grated Parmesan cheese. Let the soup rest on Keep Warm mode for 2-3 minutes until spinach wilts and soup reaches desired creamy consistency.
07 - Taste the soup and adjust salt or pepper as needed. Serve hot while the tortellini is tender and the broth is creamy and well-combined.