Heat the oven to 400 degrees.
Place the potatoes in a large saucepan and fill with enough water to cover the potatoes. Place on the stovetop. Bring the potatoes to a boil and cook until the potatoes are easily pierced with a fork, about 20-25 minutes.
Meanwhile, in a large bowl, combine the olive oil and salt. Set aside.
Strain the cooked potatoes from the water. Place the potatoes in the olive oil mixture mixture. Toss and stir to coat the potatoes.
With a slotted spoon, place the potatoes on a rimmed baking sheet (for easy clean-up line the baking sheet with foil).
With the back of a spatula, or a large spoon, press down on the center of the potatoes until they are “smashed.” Continue to do this with every potato.
Drizzle the any leftover oil and salt mixture on top of the potatoes.
Place in the oven and roast for 15-20 minutes, or until the tops are slightly crispy. Drizzle the chimichurri onto the potatoes. Serve immediately.