Preheat the oven to 400 degrees and lightly grease a cast iron skillet (or baking dish).
Use a mandoline or very sharp knife to slice the peeled potatoes.
Transfer the potatoes to a mixing bowl and add the melted butter, herbs, dry seasonings and vegan parmesan. Use your hands to evenly coat all of the potato slices.
Layer the potato slices in the cast iron skillet in a circular shape. Cover with foil and place in the oven for 40 minutes. Remove the foil and cook for an additional 20 minutes - turn the oven to broil for the last couple minutes for a crispier topping.
Top with more fresh herbs & sea salt (optional) and serve hot.
Video
Notes
Try to get sweet potatoes that are similar in shape so that it will be easier to shape them in the skillet.
This is best served right away - I like reheating the leftovers in my air fryer to get it crispy again.
You can't really prep this ahead of time, because once you cut the potatoes they will start to brown.