Remove the potatoes from the oven and slide them to 1 side of the pan. Add the chicken and any sauce left in the bowl to the other side. Return to the oven and continue roasting another 15 minutes, until the chicken is cooked through. During the last 2-3 minutes of cooking, switch the oven to broil and broil until the chicken chars on the edges and the sauce sticks to the chicken. Watch closely, the broiler can burn food fast. Serve with Yum Yum sauce drizzled on, avocado and scallions. Also, a touch of sriracha, if desired.