Heat Oven To 400 Degrees F. Cook And Stir Chicken And Vegetables In Large Skillet Sprayed With Cooking Spray On Medium-High Heat 4 To 5 Min. Or Until Chicken Is Done. Spread Pizza Crust With Barbecue Sauce; Top With Chicken Mixture And Cheese. Place Crust Directly On Middle Oven Rack. Bake 15 To 18 Min. Or Until Cheese Is Melted.