Preheat grill to high + oil grates; rub chicken breasts with 1 tbsp oil, salt/pep + seasoning blend; grill 2 min with lid closed, flip over + grill 2-3 min more until cooked through

Meanwhile, slice 2 heads of lettuce in half, drizzle with 2 tbsp oil + salt/pep; grill cut-side down, 3 min with lid closed; flip + grill 3-4 min more until charred + slightly softened

Grill scallions about 3-4 min until charred + softened

Slice tomatoes in half + finely chop grilled scallions; add chicken + lettuce to plates, scatter tomatoes/scallions on top + drizzle on dressing—looks good!