Preheat the oven to 400°F (204°C) with an oven rack positioned in the center.
Wash and dry the potatoes thoroughly, then cut larger specimens into quarters and smaller ones into halves to ensure consistent piece sizes.
In a large mixing bowl, combine the cut potatoes, olive oil, minced garlic, half of the fresh parsley, salt, and black pepper.
Toss the ingredients until the potatoes are uniformly coated with the oil and spice mixture.
Transfer the coated potatoes onto a large sheet pan, arranging them in a single, uncrowded layer with the flat, cut sides facing directly down against the pan.
Roast in the preheated oven for 45 to 55 minutes, turning the potatoes with a metal spatula halfway through the cooking time to ensure even browning.
Remove the sheet pan from the oven when the potatoes are crisp, deep golden-brown on the exterior, and fork-tender at the center.
Transfer to a serving vessel, garnish with the remaining fresh parsley, and serve immediately.