This time most every year, I have a decent crop of basil plants growing here and there. I always try to plant some for drying purposes since I love to use dried basil during the winter for both my chili and spaghetti dishes. Basil is one herb that retains its essential oils rather well over the winter time if they have been properly dried first.
My method of drying involves a simple process. I gather the leaves then cut them up unto small pieces with a knife. Note that I do not wash the leaves first! That would remove the very oil you are trying to preserve! Inspect them carefully and remove any foreign matter. Next I take a cookie pan from the oven, cover it with paper towels and then will sprinkle the leaf pieces evenly over the top. Over this will go a cooking drying grill that helps to keep the dried leaves safe from the winds. That done, all there is left to do is leave the tray in a sunny location for the day and voila, you have dried leaves that can be crushed by hand and then stored in a suitable container.