Spinach Herb Souffle

Name: Spinach Herb Souffle
Ingredients: 5 tablespoons unsalted butter, softened; 1/3 cup plus 1 tablespoon freshly grated Parmesan cheese; 2 green onions, green parts only, minced; 1 cup cooked spinach, drained, or 1 (10-ounce) package frozen spinach, thawed; 1 tablespoon finely chopped fresh parsley; 2 tablespoons finely chopped fresh basil; 1 tablespoon fresh thyme leaves; Kosher salt and freshly ground pepper; 1 cup whole milk; 3 tablespoons unbleached all-purpose flour; Dash of hot sauce; 4 large egg yolks; 5 large egg whites, cold