Slice beets on thinnest setting using a mandolin. This gives you paper thin wafers that are relatively consistent in thickness. TIP: Use a glass or non-porous cutting board/mat. Beets stain surfaces! You can use red or yellow beets, or a mixture.
Place sliced beets in a glass bowl and toss with EVOO and salt. Allow to sit for 20 minutes. This process (salt) draws excess moisture from the beets. Once 20 min have passed toss beets in their liquid and drain.
Place slices in a single layer on parchment lined baking sheets. Sprinkle with a bit of sugar, this brings sweetness back out. Sprinkle with rosemary powder.
Bake 30-50 minutes. Until crisp. Remove from oven and allow to cool.
Place in air tight container with a silica packet. If you do not have some silica packets laying around (they come in jerky packages, etc.) make a small rice sock. This process keeps the chips crisp while in container rather than the chips absorbing the moisture from the air the rice/ silica do.