Place the potatoes in a pot,add salt and pepper, to taste. Cover potatoes halfway with chicken stock, add the butter and cover skillet with a lid. Cook the potatoes in the stock until almost tender, about 8 minutes, depending upon the size of the potatoes. Remove the lid and allow the stock to evaporate, about another 5 minutes. Once the stock evaporates smash each potato using a large spoon, creating a small crack in each. Allow the potatoes to brown on each side, another 5 minutes, and re-season with salt and pepper. Remove the browned potatoes from the skillet and place onto a serving platter, garnished with the parsley.