PREHEAT oven to 425°F. Toss bread cubes with 1/4 cup of the dressing; spread into 15x10x1-inch baking pan. Bake 8 to 12 min. or until lightly toasted, stirring occasionally.
MEANWHILE, mix tomatoes, onions and remaining 1/2 cup dressing in large bowl. Add greens, cheese and basil; toss lightly.
ADD toasted bread cubes just before serving; mix lightly.