Buffalo Chicken Pizza

Name: Buffalo Chicken Pizza
Ingredients: 1/4 cup (2 fl. oz./60 ml) hot sauce, preferably Frank’s RedHot cayenne pepper sauce; 4 Tbs. (1/2 stick) (2 oz./60 g) unsalted butter, melted; Kosher salt and freshly ground pepper; 1 cup (6 oz./185 g) shredded cooked chicken; 1 tsp. garlic powder; All-purpose flour for dusting; 6 oz. (185 g) pizza dough, homemade or store-bought; 1/2 cup (2 oz./60 g) shredded mozzarella; 1/4 cup (1 oz./30 g) crumbled blue cheese; 1/4 cup (2 oz./60 g) sour cream; 1/4 cup (1 oz./30 g) thinly sliced celery