Pre-heat oven to 180° / 250F
Halve the potatoes to fit in the food processor chute. Use the smallest slicer blade on your food processor to achieve "pringle" like potato slices. Process all potatoes like this
Grease a baking dish before placing 1 layer of potato slices in the dish. Use half of your potato "pringle slices"
Evenly spread the finely chopped spinach over the first layer of potato
Place vegan butter over the spinach in even intervals or pour evenly if melted. Use only half of your butter here (1 tbsp)
Lay the final layer of potato slices over the spinach. Use the prettiest "pringle slices" on top
Repeat step 5 with the butter for the final layer
Cover with foil and bake for 35 minutes
Remove from the oven and sprinkle vegan parmesan on top, as well as any herbs (chives or parsley) if using
Bake for another 20 minutes (until top layer has started to brown with a crispy top). Bake WITHOUT a cover this time to make sure it goes crispy (YUM!)