Step 1

Preheat the oven to 425°F.

Step 2

Peel the potatoes and cut them in half lengthwise. Then, cut each potato half into slices about a 1/4" thick.

Step 3

Place the potatoes in a large saucepan and add water to cover. Bring the water to a boil over high heat. As soon as a boil has been reached, boil for 5-6, until they are al dente. Drain well and set aside until ready to use.

Step 4

Add the butter to a large, oven-safe skillet (cast iron is best) over medium heat. Add the sliced onions and cook for 10-12 minutes, stirring every so often until softened. Add the garlic and cook 1 minute more.

Step 5

Turn off the heat and transfer the onions and garlic to a bowl off to the side.

Step 6

Transfer half of the potatoes to the pan and sprinkle 1 teaspoon salt and 1/2 teaspoon black pepper over the top of them.

Step 7

Scatter the onions and garlic across the potatoes. Then, top with a layer of the remaining potatoes, another 1 teaspoon of salt and 1/2 teaspoon of pepper. Drizzle olive oil over the top and transfer to the oven.

Step 8

Bake for 40 minutes. Sprinkle with parsley, serve warm and enjoy.