Herbed Gorgonzola Mushroom Frittata

Name: Herbed Gorgonzola Mushroom Frittata
Ingredients: 1 tablespoon extra-virgin olive oil; 1 pound mixed mushrooms, (such as shiitake, cremini, or oyster), thinly sliced; Kosher salt and freshly ground pepper; 4 scallions, white and green thinly sliced; 1 cup chopped flat-leaf parsley, plus 1 tablespoon; 1 tablespoon chopped fresh tarragon leaves; 12 large eggs, beaten; 1/2 cup mushroom broth (see cook's note); 1 1/2 teaspoons kosher salt; Freshly ground black pepper; 2/3 cup crumbled gorgonzola (about 2 ounces)