Mix sauce ingredients well.
Cover a cookie sheet with foil and a layer of parchment paper for easy cleanup.
Spread the potatoes, then onion, and garlic as shown in the video.
Lay the spatchcock chicken on top and work with a brush to cover the entire chicken and the potatoes with the amazing sauce.
Bake at 375 for 1.5 hours.
Turn off the oven and leave the chicken in the oven for another 30 min and up to two hours.
