Wild Mushroom Pizza with Thyme and Oregano

Name: Wild Mushroom Pizza with Thyme and Oregano
Ingredients: 3 Tbs. unsalted butter; 3 Tbs. all-purpose flour; 1 cup (8 fl. oz./250 ml) milk; 1 Tbs. chopped fresh oregano; Kosher salt and freshly ground pepper; All-purpose flour for dusting; 6 oz. (185 g) pizza dough, homemade or store-bought; 3/4 cup (3 oz./90 g) shredded fontina cheese; 6 oz. (185 g) mixed wild mushrooms, such as chanterelles, shiitakes or oyster mushrooms, trimmed and sliced; 1 Tbs. chopped fresh thyme; Fresh thyme and oregano sprigs for garnish (optional)