Step 1

Combine chicken broth and orzo in a multi-functional pressure cooker (such as Instant Pot®); stir to combine. Close and lock the lid. Select high pressure according to manufacturer's instructions; set timer for 5 minutes. Allow 10 to 15 minutes for pressure to build.

Step 2

Release pressure carefully using the quick-release method according to manufacturer's instructions, about 5 minutes. Unlock and remove the lid. Switch to Saute function. Stir in butter, minced garlic, spinach, and mushrooms. Season with salt and pepper.