Preheat your oven to 425°F (220°C). Line a large, sturdy baking sheet with parchment paper for easier cleanup.

Place the cubed potatoes in a large bowl. Drizzle with olive oil and toss thoroughly to ensure every piece is lightly coated.

In a small bowl, whisk together the smoked paprika, garlic powder, cayenne pepper (if using), kosher salt, and black pepper. Sprinkle this seasoning mix over the oiled potatoes and toss again until the spices are evenly distributed.

Spread the seasoned potatoes in a single layer on the prepared baking sheet. It is crucial that the potatoes are not crowded; use two sheets if necessary. Crowding will steam the potatoes instead of crisping them.

Roast for 25 minutes. Then, carefully remove the tray from the oven, flip the potatoes using a large spatula, and return to the oven for another 20 minutes, or until deep golden brown and shatteringly crisp.

Remove from the oven, immediately toss with the fresh chopped parsley, and serve hot alongside your favorite BBQ mains.