Peel the sweet potatoes and cut into thin disk slices, approximately 1/8 of an inch thick. I like to use a mandolin slicer for uniform slices.
In a medium mixing bowl, whisk together the extra virgin olive oil, rosemary, garlic, salt, black pepper, and parmesan cheese. Toss the sweet potato disks in the olive oil mixture.
Line a rimmed baking sheet with aluminum foil and assemble stacks 4-5 slices high, using wider slices for the base. Make sure to get Parmesan cheese in between each slice to serve as the "glue".
Bake for 20-25 minutes or until stacks are tender on the inside but have crispy exteriors. Use the toothpick test down the center to check for doneness.
Honey Butter Topping:
Melt the butter in a small microwave safe bowl for 30 seconds. Whisk in the honey.
Evenly spoon the melted honey butter over each sweet potato stack.
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