HEAT oven to 400ºF.
UNROLL pizza dough on baking sheet sprayed with cooking spray; press into 15x10-inch rectangle. Bake 10 min.
MIX mayo and 1/3 cup dressing; spread onto crust. Top with half the cheese, chicken, remaining cheese and bacon.
BAKE 5 min. or until cheese is melted and crust is golden brown. Top with lettuce, tomatoes and remaining dressing.