Preheat oven to 350F. Spray baking sheet with non-stick spray and set aside.

Scrub beets and cut off the ends. Using a mandolin slicer, slice the beets to 1/16th inch thickness.

In a medium bowl, combine beets, oil and salt. Toss until beets are well coated. Let sit for 5-10 minutes. Discard any excess liquid in the bowl.

Place beet slices on single layer on baking sheet. Bake for 15 minutes, flipping beets half way through cooking time.