1Heat oven to 450°F. In medium bowl, mix 3/4 cup of the flour, the sugar, yeast and salt. Stir in warm water and oil. Beat with electric mixer on low speed 30 seconds. Beat on high speed 1 minute. Stir in 1/3 cup cornmeal and remaining 3/4 cup flour to make a soft dough.
2On lightly floured surface, knead dough until smooth and elastic, about 5 minutes. Cover; let rest 10 minutes.
3Spray large cookie sheet with cooking spray; sprinkle with additional cornmeal. On cookie sheet, press dough into 14x10-inch rectangle; prick with fork. Bake 8 to 10 minutes or until edges just begin to turn brown.
4Sprinkle with 1 cup of the cheese blend. Top with chicken, tomatoes and bell pepper. Sprinkle with remaining 1 cup cheese. Bake 6 to 8 minutes longer or until cheese is melted and edges are golden brown. Sprinkle with onions and cilantro.