You can dehydrate mushrooms at home easily. Preheat your oven to 150 degrees F. Meanwhile, clean your mushrooms. To clean, first, wash the mushrooms with water and dry them on a paper towel. Gently squeeze the excess water. Now cut the mushrooms into thick slices. This will help in the drying. You can dry the whole mushrooms too, but it will delay the process. Spread the mushroom slices on a baking sheet in a single layer. Put the baking sheet in the oven for 1 hour. Now flip the slices and keep them in the oven for another hour. Remove the mushrooms from the oven and let them cool. Check if they are crispy. If not, place them in the oven for another 30 minutes until done.