Preheat your oven to 400 degrees f. and line a large sheet pan with parchment paper.
Boil the potatoes in salted water for 15-20 minutes, or until just fork tender (but
not mushy!), then drain well.
Transfer the potatoes to your prepared baking sheet and using a potato masher or the base of a small bowl, gently smash each to a 1/2-inch thickness.
Season with garlic salt, chili flakes, and lightly spritz evenly with oil.
Roast for 25-30 minutes, flipping halfway.
Sprinkle with fresh parsley and enjoy immediately!