Preheat the oven to 400°F. Spray a 9-inch round baking dish with non-stick cooking spray, or lightly brush with olive oil.

In a large bowl, toss the sweet potato slices with the pesto until fully coated.

Arrange the sweet potatoes in the prepared baking dish in an overlapping single layer pattern and sprinkle with Parmesan cheese.

Cover with aluminum foil and bake for 45 minutes. Remove cover and continue baking for an additional 10 minutes, or until potatoes are fork tender. Serve hot or at room temperature.