Spatchcocking the chicken promotes more even cooking since the chicken is lying flat. In addition, it prevents the breast meat from drying out (they cook quicker than the thighs when the chicken is whole) since spatchcocking allows both the thighs and chicken to be done at the same time. Another benefit of the chicken lying flat is that there is maximum exposure of the skin to the heat source. This means more delicious crispy and charred skin.