Preheat the oven to 425 degrees F. Line a baking sheet with parchment paper and set aside.
Wash the potatoes, then dice them into 1/2-inch cubes.
Add diced potatoes to a large mixing bowl. Then add olive oil, garlic powder, thyme, oregano, kosher salt, and fresh ground black pepper. Mix well.
Spread the potatoes in an even layer on the baking sheet. Roast for about 30 to 35 minutes without stirring until browned, depending on the size of the pieces.
Remove the potatoes from the oven and garnish with optional parley.