Start with washing the herbs and ensure the excess water is removed. If it's clean, washing them isn't necessary. 

Remove leaves from the stem. Discard anything that's discolored. 

Sandwich the herbs in a single layer between two pieces of paper towel.

Microwave it on medium to high power for 30 seconds. 

Remove them from the microwave and let them cool for a few minutes. 

Store it in an airtight container or glass herb jar.