Preheat the oven to 375°F.
Pat the chicken skin dry with a paper towel.
Add the spice rub ingredients into a small mixing bowl. Mix until all the spices are combined.
1 tablespoon Garlic powder, 1 tablespoon Onion powder, 1 tablespoon Brown sugar, 2 teaspoon Smoked paprika, ½ teaspoon Ground mustard, 1 teaspoon Kosher salt
Using kitchen shears, cut two slits along the backbone of the chicken, to remove it. Once removed, flip the chicken over and press firmly on the breastbone to flatten the chicken.
3 lb Whole chicken
Transfer the spatchcocked chicken to a cast iron skillet.
Drizzle the chicken with the olive oil, and season the chicken with salt and pepper on both sides. Sprinkle the spice rub onto the chicken skin, and rub into the olive oil until the skin is completely coated with the seasoning rub.
¼ cup Extra virgin olive oil
Arrange the lemon, onion, garlic, and thyme springs into the skillet with the seasoned chicken. Roast the chicken for approximately 1 hour, or until the internal temperature reaches 165°F on a meat thermometer.
2 heads Garlic, 2 Vidalia onions, 2 Lemons, 4 springs Fresh thyme
Once the chicken is cooked, remove it from the oven and cover with foil. Let the chicken rest for 10 minutes before carving it.