In a bowl, whisk together the marinade ingredients.
With kitchen shears, cut the backbone out of the chicken and either discard or save for chicken stock. Use your hands to press on the chicken to flatten it.
Place the chicken into a large baking dish and use your hands to spread the marinade all over the chicken on both sides. Refrigerate for at least 6 hours but preferably overnight, flipping the chicken at the halfway point to ensure even marination.
Remove the chicken from the fridge. Place the chicken on a wire rack or baking sheet, saving the marinade, and let sit for 1 hour before roasting.
Preheat the oven to 450°F and set the rack to the middle level.
Pat the chicken skin dry of accumulated moisture.
Heat a cast iron or stainless steel pan to medium-high heat with a 1/4 cup of olive oil. Once shimmering, pat the chicken skin dry one more time then carefully place skin-side down into the oil. Place a foil wrapped smaller cast iron pan or foil wrapped bricks onto the chicken to press it down into the oil. Fry the chicken for 5-7 minutes or until nicely browned then place into the oven. The pans will be very heavy.
After 20 minutes remove from the oven and flip the chicken. Pour the saved marinade on top of the chicken and place the pan back on top of the chicken. Roast for another 15-20 minutes or until the center of the breast reaches 160°F internal temp when checked with am instant-read thermometer.
After removing from the oven, let the chicken rest for 10 minutes before serving so that it reabsorbs some of the pan juices. The pan sauce is great over rice or with a loaf of crusty bread. Enjoy!