Preheat oven to 450 degrees and line a baking sheet with parchment paper.
Wash potatoes well and, leaving the skin on, slice them into ¼-1/2" rounds. Cut the rounds in half to make half moons.
In a medium bowl, toss the rounds with oil, salt and pepper. Add maple syrup and toss again.
Spread the sweet potato slices in a single layer on the baking sheet and bake for 20-25 minutes, flipping halfway through the baking time, until potatoes are tender and slightly caramelized.