Heat oven to 400°F. Line large cookie sheet with parchment paper. Unroll dough on cookie sheet. Bake 14 to 16 minutes or until crust is golden brown. Remove to cooling rack; cool 5 minutes. Tear crust into bite-size pieces; set aside.
Meanwhile, in 12-inch nonstick skillet, heat 1 tablespoon of the oil over medium-high heat. Add chicken, onion, 1/2 teaspoon salt and 1/4 teaspoon pepper; cook 5 to 7 minutes, stirring occasionally or until chicken is no longer pink in center and onion starts to caramelize. Stir in cranberries; cook an additional 2 to 3 minutes. Place chicken mixture in large serving bowl. Keep warm. Wipe out skillet.
In same skillet, add remaining 2 tablespoons oil; heat over medium heat. Add bread pieces; sprinkle with 1/4 teaspoon salt and 1/4 teaspoon pepper. Cook 2 to 5 minutes, stirring frequently until golden brown and toasted.
Add romaine, bread pieces and dressing to chicken mixture; toss well.