Buffalo Chicken Mac and Cheese

Name: Buffalo Chicken Mac and Cheese
Ingredients: 1 pound elbow macaroni; 2 tablespoons unsalted butter; 1 tablespoon dried minced onion; ½ teaspoon kosher salt; ½ teaspoon white pepper; ¼ cup flour; 1 1/2 cup milk (2% or whole); ½ cup Buffalo Sauce , click for homemade; 2 tablespoons mayonnaise; 2 cups cheddar cheese , grated; 2 cups chicken , shredded; 2 tablespoons Italian Style bread crumbs; 2 tablespoons blue cheese crumbles , optional; 1 tablespoon parsley , minced, optional; Celery and Carrot Sticks