Toss the chicken with the cauliflower, tomatoes, potatoes, oil, Italian seasoning, salt and pepper in a large bowl. Transfer the chicken mixture to a rimmed sheet pan. Roast until the chicken and cauliflower are golden and the chicken is cooked through, 40 to 50 minutes.
Combine the parsley, capers, pine nuts and golden raisins in a small bowl. Sprinkle over the chicken to serve.
If your meat department doesn't have skinless bone-in chicken thighs, simply remove the skin at home with some kitchen shears then pull off with a paper towel.