Preheat oven to 400°F (200°C) for a more browned soufflé with a slightly looser center or 375°F (190°C) for a more gently cooked soufflé that sets all the way through. Set oven rack in lowest position. Grease interior of a 48-ounce ramekin with softened butter. Add some grated Parmigiano-Reggiano, rotating ramekin all around so cheese…