Preheat oven to 450 degrees.
Line baking sheet with foil.
Mix together olive oil, maple syrup, and cayenne pepper in a small bowl.
Brush sweet potato slices with maple mixture and place on a prepared baking sheet.
Bake in preheated oven for 8 minutes, turning slices over afterward.
Brush with remaining maple mixture and continue baking about 7 more minutes, or until tender in the middle and crispy at the edges.