Step 1

Quarter 1 pound red or Yukon gold potatoes lengthwise, then cut each piece crosswise into 1-inch wide chunks. Heat 2 tablespoons vegetable oil in a 10 to 12-inch cast iron skillet over medium heat until shimmering. (Alternatively, use a nonstick skillet and 1 1/2 tablespoons oil.) Add the potatoes, arrange in a single layer cut-side down, and season with 1/2 teaspoon of the kosher salt.

Step 2

Cover with a tightfitting lid and cook undisturbed until the potatoes are tender and the bottoms are golden brown, about 20 minutes. Meanwhile, finely chop the herb of your choice, 1 teaspoon thyme or oregano, or 1/2 teaspoon rosemary.

Step 3

Uncover and flip each piece with tongs to a second cut side. Season with the remaining 1/2 teaspoon kosher salt and a few grinds of black pepper. Increase the heat to medium high and cook uncovered until the second side is golden brown, 5 to 10 minutes more, moving the pieces around as needed so they brown evenly.

Step 4

Add the herb and 1 tablespoon unsalted butter if desired and cook, tossing occasionally, until the butter is melted and the herbs are fragrant, about 1 minute. Taste and season with more salt as needed.