This citrusy chicken dish is wonderful with rice pilaf and broccoli. Pair with lighter style Chardonnay like South Island or Pomona Winds.
Preheat oven to 450 degrees. Mash garlic and 1 teaspoon salt into a paste.
Combine garlic paste, butter, zest, and chopped thyme. Gently separate skin from breast of chicken, and rub half of the butter mixture under the skin on each side. Season with salt.
Fill cavity with 2 orange wedges, 1 onion wedge, and thyme sprigs. Place chicken, breast side up, on a rimmed baking sheet, and tuck wings under. Tie legs together with kitchen twine. Scatter remaining oranges and onions around chicken. Dot oranges and onions with 1 tablespoon butter mixture.
Roast for 30 minutes. Brush chicken with remaining butter mixture. Flip oranges and onions. Rotate sheet, and roast for 15 minutes more. Remove oranges and onions if caramelized. Roast chicken until juices run clear and an instant-read thermometer inserted into the thickest part of a thigh reaches 165 degrees, 10 to 15 minutes more. Let rest for 10 minutes before serving.