Preheat oven to 400 degrees. Spray a rimmed, light colored, 18 by 13-inch baking sheet with non-stick cooking spray.
Place potatoes in center of baking sheet, drizzle with olive oil, sprinkle with oregano, salt and pepper then toss to evenly coat.
Spread potatoes into an even layer across baking sheet.
Roast in preheated oven until nearly tender and just beggining to brown lightly, tossing once halfway through, about 30 - 35 minutes total.
Remove from oven, scoot potatoes to center, drizzle with lemon juice, sprinkle with garlic, toss to coat. Spread back out into an even layer.
Roast 10 minutes longer or until fully tender and golden brown in places.
Sprinkle with parsley and serve warm.
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