Preheat oven to 350°F. Get out a large rimmed baking sheet.

Place beets in a bowl, then add olive oil and salt. Toss to combine.

Place beets in a single layer on baking sheet. Do not overlap slices; use multiple baking sheets if needed for space. Bake for 40 minutes to 1 hour, turning slices over about halfway through cooking time. Watch carefully to prevent burning, especially if some chips are thinner than others. Cool before eating.