First, slice your potatoes real thin, I used a mandolin.
Secondly, remove excess moisture from the potatoes.
Preheat the cast iron with the 2 tbsp of olive oil.
Add the melted butter to the potatoes with the seasoned salt and pepper.
Start layering your potatoes on the cast iron, starting from the center. After each layer put some cheese, then more potatoes. Repeat for about 6-7 layers. Make sure the last layer is potatoes and not cheese.
Cover the top of the potatoes with parchment paper and add something heavy.
Cook on the stove at medium high for about 7-8 minutes.
Remove the parchment paper and bake at 400F for 55 minutes.
Lastly, place the parchment on top of the potatoes again, flip it onto a cutting board. Add flaky sea salt. Cut into triangles and transfer to a plate. Remove the parchment paper, add chives and black pepper.