Preheat conventional oven to 450°F.
In medium bowl, combine the Ultimate White Cheese Sauce and Buffalo sauce. Set aside.
To assemble pizza, spread 1 1/2 cups Buffalo sauce mixture evenly on top of crust. Top crust with 6 ounces chicken, 3 ounces celery, 2 tablespoons onion and 2 tablespoons red peppers. Add 6 ounces Mozzarella Cheese evenly on top of other ingredients. Drizzle 2 tablespoons Buffalo sauce evenly over cheese.
Bake pizza for 10 to 15 minutes, until hot, golden brown and bubbly.
CCP: Heat to 165°F for at least 15 seconds
Cut pizza into 6 servings.
CCP: Maintain hot food at 135°F or above