Add all ingredients except spinach and Parmesan cheese to the Instant Pot®. Lock lid.
Press the Manual or Pressure Cook button and adjust cook time to 10 minutes. When timer beeps, quick-release pressure until float valve drops and then unlock lid. Add spinach and stir gently until wilted.
Ladle soup into four bowls, garnish with Parmesan cheese, and serve warm.
Notes
WHAT IF ORZO IS UNAVAILABLE? Orzo, also known as risoni, is simply a rice-shaped pasta. If you can’t find orzo in the store or online, simply replace it with a short-grain white rice.