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 crust is deep golden brown and cheese is melted. Top with lettuce and tomatoes; drizzle with remaining dressing.