Preheat oven to 425 degrees F.
Peel the skin of sweet potatoes and cut into 3/4th to 1 inch discs. Toss sweet potatoes with olive oil and place on a baking sheet (not touching each other). Bake for 20-30 minutes, until lightly browned and a knife inserted in the middle of a sweet potato slides easily.
Place pan on a wire rack to cool.