Place the potatoes in a medium-large saucepan. Add 2 tablespoons of kosher salt and crushed garlic clove. Cover with water. Bring to a rolling boil over medium high heat. Remove from heat and allow potatoes to sit in the water until room temperature (at least 90 minutes).
Once cooled, drain the potatoes. Toss with olive oil, parmesan cheese, kosher salt, pepper, and ground rosemary. If you need a measurement, I would say about ½ teaspoon a piece. I simply pour a little in my palm and toss it in.
Preheat the oven to 425 degrees. Place the potatoes on a baking sheet that’s been sprayed with non-stick cooking spray. Using a flat bottomed cup (I use a fermentation tamper), smash each potato with some force.
Bake the potatoes for 15-20 minutes, until crispy.
Notes
Optional: For a little more indulgence, toss the potatoes in some melted butter before baking them as well.