how to completely dry mushrooms
Drying Mushrooms In The Oven. 1  1. Clean the mushrooms you are going to dry. 2  2. Cut the mushrooms. 3  3. Place the mushrooms on a baking sheet.  4. Preheat the oven to 150 degrees Fahrenheit (65 1  Celsius). 5. Take the mushrooms out of the oven after an hour.  6. Place the mushrooms back in the oven.