Preparation Preheat oven to 500°F with rack in upper third. Mince and mash garlic to a paste with 1/2 teaspoon salt, then transfer to a bowl. Stir in oregano, red-pepper flakes, oil, 1/2 teaspoon salt, and 1/2 teaspoon pepper. Cut a 2-inch-long pocket (about 1 1/2 inches deep) horizontally in side of each breast half and spread 1/2 teaspoon garlic mixture into each pocket. Coat chicken with remaining garlic mixture. Roast chicken, skin sides up, in a foil-lined large shallow baking pan until just cooked through, 20 to 25 minutes.
Preparation Preheat oven to 500°F with rack in upper third. Mince and mash garlic to a paste with 1/2 teaspoon salt, then transfer to a bowl. Stir in oregano, red-pepper flakes, oil, 1/2 teaspoon salt, and 1/2 teaspoon pepper. Cut a 2-inch-long pocket (about 1 1/2 inches deep) horizontally in side of each breast half and spread 1/2 teaspoon garlic mixture into each pocket. Coat chicken with remaining garlic mixture. Roast chicken, skin sides up, in a foil-lined large shallow baking pan until just cooked through, 20 to 25 minutes.