Preheat the oven to 425°F (220°C).
Chop the potatoes into bite-size pieces and place them in a large bowl.
Drizzle the olive oil over the potatoes and toss with your hands to coat thoroughly.
Sprinkle generously with salt, pepper, and minced rosemary. Toss again to distribute the spices evenly.
Spread the potatoes across a well-oiled baking sheet.
Roast for 35-40 minutes, stirring the potatoes and turning them over with a large spatula once halfway through.
Potatoes are done when they are fork-tender, golden brown, and slightly crisp on the edges.
Sprinkle with chopped chives before serving, if desired.