It is acceptable to use a microwave oven to dry herbs. The microwave method is quick and easy, and it does a good job of retaining the flavor and the color of the herbs.
The process of drying herbs in a microwave involves cleaning the herbs and removing excess water before spreading them on a microwave-safe plate and microwaving them until they are dry and crispy. The drying time varies according to the type of herb, and it is advisable to check the herbs after every 20 or 30 seconds to test them for doneness. The herbs should crumble easily between the fingers when they are fully dry.