Heat an 8 or 9-inch oven-proof saute pan (or a well seasoned cast iron skillet) over medium heat. Spoon 2 1/2 tablespoons of butter into the pan and swirl to coat. Lay a layer of potatoes, slightly overlapping to cover the bottom of the pan in circular, concentric pattern. Brush with butter over and season with a pinch of the salt/pepper/spice mixture. Repeat adding layers of potatoes, butter and spice mixture until you've used all the potatoes. On top of the last layer of potatoes, brush with butter one last time. By this time, the bottom layer should be busy crisping.