Preheat the oven to 325 degrees F.
Slice the beets on a mandolin, about 1/16th of an inch, for best results. Or, you can slice them with a knife. Using disposable gloves will keep your hands from turning colors from the beets.
Place the beets in a medium bowl, sprinkle with half of the salt, toss the beets, and sprinkle with the remaining half. Let the beets sit for 15 to 20 minutes to pull extra moisture out of them.
While the beets are “sweating,” line a baking sheet with parchment paper.
Drain off excess moisture and pat the slices dry.
There are two methods you can use here. One is simply to lay the slices onto the parchment. The other method is to use a rack over the pan with the parchment. Either works fine. Use two baking sheets if needed.
Drizzle the beets with oil and sprinkle with pepper.
If you would like to use the Warm Spice Mixture, simply combine the three dry spices in a bowl and sprinkle over the beets, after drizzling with the oil.
Bake in the oven for 45 to 55 minutes, checking to make sure they’re not burning. Depending on the diameter and thickness of your beet slices, baking time may take more or less minutes. If you like the centers to still be somewhat chewy, you may remove them from the oven before the chips fully crisp up. They will get crispier as they cool, unless you have allowed for chewiness. (You can remove the smaller chips that have already crisped up and allow the others to continue cooking.)
Remove the beet chips from the oven and allow them to cool.
Serve alone or with your favorite dip.