Yes, in an oven.You can put them directly on the oven rack or on a pizza pan (with holes in it), on low heat around 200 degrees give or take. It is very important to leave the oven door cracked about an inch or a little more. It will take around three hours but on some ovens this can be longer, or shorter. Keep an eye on it. I now have a dehydrator, but this is the way my brother an I used to do it, and it works well.

Good luck to you