Peel the potatoes. Next, using a mandoline on the thinnest setting, slice each potato into thin slices (making sure to use the safety guard). I like 1/16th inch slices; they will look translucent but hold their shape.
Make the marinade: In a large bowl, mix the olive oil, oregano, garlic, mustard, lemon zest, lemon juice, and salt and mix well. Add the potato slices. Massage the marinade well with your hands making sure all the potato slices are coated.
Stack the potato slices in the wells of the muffin pan, making sure to stack higher than the muffin pan (the potatoes will shrink while they bake). This recipe makes 6 stacks.
Cover the muffin pan with foil and bake for 20 minutes. Uncover and bake for another 25 minutes, or until golden and crispy. Enjoy!
Video
Notes
Towering Stacks: These stacks look most impressive when they are stacked tall...at minimum, they should reach above the walls of the muffin pan. The number of slices per stack will vary, depending on the size of the potatoes you use. It's always a good idea to have extra potatoes on hand when making this recipe.
Make it Cheesy: About 5 minutes before the potatoes are done cooking, sprinkle them with a generous amount of Parmigiano Reggiano or your favorite grated, firm cheese.
Serve them Up: Allow the potato stacks to cool slightly in the muffin pan. Then, using a butter knife or an offset spatula, carefully lift each stack out of the pan and place on a serving plate. Decorate the plate with lemon slices and/or sprigs of fresh oregano.