Preheat your oven to 400°F / 200°C. 2.
Peel the potatoes and cut them into large, 1. 5 to 2-inch chunks. 3.
In a large bowl, toss the potato chunks with olive oil, chopped rosemary, salt, and pepper until they are evenly and generously coated. 4.
Spread the potatoes in a single layer on a large baking sheet or in a roasting pan. Ensure they have space and aren't overcrowded to promote browning. 5.
Roast for 40-45 minutes, flipping them halfway through, until they are golden brown, crispy on the edges, and easily pierced with a fork.
Serve immediately.
Do not overcrowd the baking pan. Give the potatoes plenty of space to roast rather than steam. Use two pans if necessary.
Add 3-4 whole, smashed garlic cloves to the pan during the last 15 minutes of roasting for a delicious, mellow garlic flavor.