Heat oven to 400° F. Grease large cookie sheet. Cut dough in half; place on greased cookie sheet. Press each dough piece into 6-inch round. Bake 10 to 12 minutes or until crust begins to brown.
In medium bowl, combine vegetables, cheese, chicken, onions and oregano; toss to combine. Spoon vegetable mixture evenly onto crusts. Bake an additional 10 to 12 minutes or until cheese is melted and crust is golden brown.