Preheat oven to 400° and boil water in a large pot.
Add whole potatoes to boiling water and cook until very tender when pierced with a fork (about 10-15 minutes). Drain potatoes once cooked through.
Prep a baking sheet with a piece of parchment paper drizzled with 1 tbsp oil.
One by one, add a potato to the sheet pan and smash flat with a flat bottomed glass (I use a drinking glass, but a stemless wine glass would work as well). It's okay if the potatoes crowd the pan a little bit.
Sprinkle the top of the potatoes with the remaining tbsp of oil, salt, and your herb of choice.
Bake in the oven for an additional 15 minutes, or until skins start to wrinkle, and potatoes turn golden brown.
Remove from oven and serve immediately. Will keep in the fridge in an airtight container for one week.