I've seen some recipes for dehydrated beet chips, but they are completely different and I didn't find them to be nearly as good. If you don't have an air fryer, I would make them in the oven. Line a sheet pan with parchment paper and put a single layer of the beet chips on the parchment. Bake in a preheated oven at between 325-350°F and flip them several times during the baking process.