Scrub 4 russet potatoes (8 oz. each) and cut lengthwise into 3/4-inch-thick wedges; pat dry. In a large bowl, mix potatoes with 1 tablespoon olive oil, 1 tablespoon chopped fresh rosemary leaves, 1/2 teaspoon salt, and 1/4 teaspoon pepper. Spread level in a 10- by 15-inch nonstick baking pan. Bake in a 450° regular or convection oven, turning occasionally with a wide spatula, until potatoes are golden brown and tender when pierced, 35 to 40 minutes.