Preheat the oven to 400°F (200°C).
In a large bowl, combine the sliced potatoes, melted butter, salt, black pepper, and thyme.
Arrange a layer of potatoes in a spiral pattern in the bottom of a greased ovenproof skillet or baking dish.
Sprinkle a portion of the grated cheese over the potato layer.
Repeat the layering process until all the potatoes and cheese are used, finishing with cheese on top.
Place the skillet in the preheated oven and bake for 45 minutes or until the potatoes are tender and the top is golden and crispy.
Allow to cool slightly before slicing and serving. Enjoy!