Season the chicken all over inside
Refrigerate the chicken uncovered overnight
Mix garlic, paprika, rosemary, thyme, chili flakes, cumin, and olive oil into a paste
Rub the paste all over the chicken, including the wings
Slow roast the chicken
Boil the potatoes and refrigerate to cool
Mix the mayonnaise, lemon zest, lemon juice, whole grain mustard, chives, dill, salt, and black pepper to make a potato salad dressing
Toss the cooled potatoes with the dressing
