Preheat the oven to 450 degrees F.

Steam the potatoes, whole, for 20 minutes, until they are still firm yet easily pierced with a fork.

Drain the potatoes.

Spray a baking sheet with cooking spray.

Place a potato on the tray.

Cut a small cross about 1/4-inch deep into the potato.

Crush the potato with the back of a wooden spoon to flatten into a patty about 1/2-inch thick.

Ensure the potato stays together with most of its skin intact.

Repeat with the remaining potatoes.

Brush the tops of the potatoes with olive oil.

Sprinkle with salt.

Bake until crisp and golden, about 20 minutes.