Prep Mushrooms: Clean mushrooms, cutting any in half that aren't bite-sized.
Cook Mushrooms: Heat oil in a large saute pan over medium heat. Add mushrooms and cook, stirring often, until they release their water and the water evaporates, about 10 to 15 minutes.
Add Flavors: Add miso, butter, and garlic. Continue cooking for 3 minutes until garlic is fragrant.
Finish: Remove from heat and add rice vinegar to the pan. Stir, scraping up any tasty bits that may be stuck on the pan, then serve!
Video
Notes
Store leftovers in an airtight container in the fridge for 3 to 4 days. Reheat on the stove or in the air fryer for a few minutes until hot.