Preheat oven to 400F. Add a layer of parchment paper to 2 baking sheets, cutting to fit the baking sheet as needed.
Scrub the sweet potatoes well. Thinly slice the sweet potatoes, leaving the skin on, with a mandolin or great knife.
Add in a single layer on the parchment paper. Drizzle with olive oil and sprinkle with salt. If you wish, add a dusting of ground cinnamon on top.
Bake in the preheated oven for 12 minutes, then flip them all over and bake another 12 to 18 minutes, or until cooked well. Some may take longer than others, depending on how thinly sliced each chip is. "Chips" will crisp up as they cool.
Serve Sweet Potato Chips as snack.