Harvest the herbs from your garden. Use a strong pair of scissors to cut stems at the base of the plant and leave a long stem.
Wash the herbs. As with any plant in the garden, it is subject to outdoor conditions and dirt. Wash them gently using the sink -- with water running on low -- or with some sort of mist spray. Lay them on a paper towel and pat dry.
Turn the oven on to about 180 degrees Fahrenheit.
Place a sheet of baking paper on the baking sheet, then place the herbs on the baking paper.
Place the sheet of herbs into the oven for drying. Leave the oven door partially open. You'll have to watch them very carefully, as it will be very easy to burn or toast the herbs and ruin them.
Flip the herbs over if necessary using tongs so that they can bake evenly. Your herbs will be done and properly dried when they appear crisp. The drying process in the conventional oven should take about three to four hours.
Place the dried herbs in a plastic bag or container for storage.