Preheat grill to high + oil grates; rub chicken breasts with 1 tbsp oil, salt/pep + seasoning packet; 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

Slice lemon in half + place on grill cut-side down; grill 3-4 min until charred

Divide chicken + lettuce to plates; add a handful of croutons + sprinkle 2 tbsp cheese over each lettuce wedge, then dress with the juice from the charred lemons