Place oven rack in upper-middle position and preheat oven to 500 degrees F . Using sharp kitchen shears, remove backbone from chicken and cut spine into 5 to 6 one-inch-long pieces. Set backbone aside. Flatten chicken by placing skin side up on a cutting board and applying firm pressure to breastbone. Transfer to a wire rack set in a foil-lined rimmed baking sheet. Position chicken so that breasts are aligned with center of baking sheet and legs are close to edge. Drizzle chicken with 1 tablespoon oil.
