Preheat the gas grill to preheat it to medium-high heat (around 375-400°F or 190-204°C). Carefully place the chicken patties directly onto the preheated grill grates. Grill the chicken patties for about 4-6 minutes on the first side. Flip them when they release easily from the grates. Grill for an additional 3-4 minutes on the other side.