Food & Cooking Recipes Healthy Recipes Gluten-Free Recipes Oven-Dried Mushrooms 4.5 (2) Close Credit: Bryan Gardner You can use any mushroom variety you like here. Learn about all the different kinds in our Mushroom Glossary. Directions Preheat oven to 170 degrees. Arrange mushrooms in a single layer on a baking sheet and bake 1 hour. Flip, then continue baking until completely dry and crisp, about 1 hour more. Store in an airtight container up to three months.