Cut the mushrooms into thin slices about 1/8 inches (0.3 cm) thick. Lay the mushrooms flat on the baking tray. Preheat the oven to 150 degrees Fahrenheit (65 degrees Celsius). After the oven reaches the specified temperature, put the baking tray and mushrooms in the oven for about an hour. After one hour, take the mushrooms out of the oven and dry them with a paper towel or a dry cloth. Put the mushrooms back in the oven and bake for another hour until they are completely dry. Cool the mushrooms in an open container.

1. Cut mushrooms into thin slices about 0.3 cm thick.

2. Put the mushrooms flat on the baking tray.

3. Preheat the oven to 150 degrees Fahrenheit (65 degrees Celsius). After the oven reaches the specified temperature, put the baking tray and mushrooms in the oven for about an hour.

4. After one hour, take the mushrooms out of the oven and dry the water with a paper towel or a dry cloth.

Put the mushrooms back in the oven and bake for another hour until they are completely dry.

6. Cool the mushrooms in an open container.

7. After completely cooling, put the mushrooms in a sealed jar for storage.