Preheat oven to 300F. Line two baking sheets with parchment.

Using a mandolin or the slicer blade of your food processor, slice beets as thin as possible. No need to peel first.

Place the beets in a large bag and pour the oil and salt over top. Shake the bag. Let sit 15-20 minutes.

Shake the bag again and drain out the liquid from the bag. Lay slices on a single layer on the baking sheet. Bake 45-60 minutes until crisp but not brown. Remove from oven and enjoy.