Preheat the oven to 400 degrees F. Line 2 baking sheets with parchment paper and set aside. Use a veggie slicer to cut the sweet potatoes into paper-thin rounds. (I set mine to the thinnest setting.) You can use a knife to do this, but it takes much longer.
Pile all the sweet potato rounds into a large bowl and pour the melted coconut oil over the top. Gently toss to coat every piece with oil. Then lay the sweet potato rounds out on the baking sheets in a single layer. Sprinkle some salt on top of the sweet potatoes.
Bake for 15 to 20 minutes and then flip the sweet potatoes for another 15 to 20 mins. Remove from the oven and cool for 5 minutes on the baking sheets. Then move the chips to a bowl, or plastic bag to store. If you happen to find a few chips with soft centers, pop them back in the oven for about 5 minutes.