Pat the chicken thighs with a paper towel to remove any excess moisture.
Season the skin on the top AND bottom of the chicken thighs heavily with Old Bay.
Preheat your grill to medium-high heat (around 400 °F) and brush the grate lightly with oil if needed.
Place the chicken on the grill, leaving room between them. Turn the chicken as needed or move if your BBQ has hot posts. I don't cook mine skin side down, they crisp up perfectly without flipping them over.
Cook the chicken until it reaches an internal temperature of 185°F.