How to Make It
Preheat oven to 425°F. Dry chicken legs thoroughly with paper towels. Toss together chicken legs and olive oil in a large bowl. Stir together salt, pepper, and rosemary in a small bowl. Sprinkle salt mixture over chicken legs, and toss to coat.
Line a half-sheet pan with aluminum foil, and spray with cooking spray. Set a wire rack in prepared pan. Arrange chicken legs in a single layer on wire rack.
Bake in preheated oven until a meat thermometer inserted into thickest portion of chicken leg registers 165°F, 35 to 40 minutes. Let chicken stand 5 minutes. Serve warm.