Preheat the oven to 300ºF / 150ºC degrees and line two large baking sheets with parchment paper.
Use a mandolin to thinly slice the beets then place between kitchen paper and press to remove any excess liquid.
Toss the beets with the oil ensuring that all slices are coated then season with salt and any other seasoning of choice.
Lay in a single layer on the baking sheets and bake for around 50 minutes until crisp. Remove any chips that may be crisping faster than others to prevent burning.
Serve with a little additional salt if required.