To dehydrate mushrooms, just wash each mushroom well first. Then slice each mushroom.
Once they are sliced, place the mushroom slices onto your dehydrator trays.
The end pieces and assorted pieces that you may normally throw away, place on the dehydrator also. These odd end pieces are what you can dehydrate for mushroom powder. Place the trays in your dehydrator and turn it on for about 4-6 hours. When the pieces are completely dry, place the slices in a jar and seal.
The dehydration process really enhances the taste of mushrooms. We use ours in soups, stocks, stews, and casseroles. To rehydrate, soak the mushrooms into hot water and let them soak for 30 minutes and then use them as a pizza topping; in gravies; in spaghetti sauce or toss into an omelet.
The ends and odd pieces I toss into the blender once they are dried and make mushroom powder.
Mushroom powder gives food a "meaty" and earthy flavor without the texture of mushrooms. You still get the boldness and flavor but many people are off-put by the texture so this is one way of getting past that. As a powder, you can sprinkle it into omelets or into a salad. I also like to add a tablespoon or two into soups & stews. Or better yet, add some into meatloaf, burgers or your spaghetti sauce. The ideas or endless.