Preheat oven to 400⁰F.
in a mortar and pestle or spice grinder, combine parsley, oregano, thyme and rosemary. Grind into a powder, or smaller pieces if using a mortar and pestle.
Place potatoes, onion, and garlic on an 11"x18" sheet pan. Drizzle on oil.
Sprinkle on the salt, pepper, and herb mix. Mix with hands (or large utensil) until thoroughly mixed and coated.
Place in the oven for 30-35 minutes, stirring the potatoes every 10-15 minutes.
When the potatoes become fork tender, set the oven to broil and allow the potatoes to get brown and crispy. Allow to cool slightly before serving.