Place rack in center of the oven then preheat to 450 degrees. Scrub and rinse potatoes, pat dry with a kitchen towel then remove any blemishes or undesirable spots using a paring knife.
Cut potatoes into 1"–1½" cubes then place into a large mixing bowl. Drizzle oil and salt over them then toss to coat. Sprinkle garlic powder, parsley flakes and red pepper flakes (if using) evenly over the potatoes, stirring frequently to ensure even distribution.
Transfer potatoes to baking sheet and bake about 45–50 minutes, turning the potatoes every 15 minutes to prevent sticking and ensure they brown on all sides. You’ll know they’re done when they are nicely browned and fork tender.
Remove from oven, transfer to a serving dish then serve immediately.
Notes
The olive oil and kosher salt works as a glue to ensure the other seasonings will stick while roasting!