Preheat oven to 200°F. Line cookie sheet with cooking parchment paper.
Slice Zucchini very thin and toss with olive oil to lightly coat in a bowl.
Place zucchini slices on cookie sheet in single layer and sprinkle evenly with salt
Bake 2 hours, rotating cookie sheet after 1 hour. After 1 hour 30 minutes, check zucchini every 10 minutes to avoid burning. Removed from oven to cooling rack.
Serve warm or cool. Store in airtight container.