Cheese Souffle

Name: Cheese Souffle
Ingredients: 4 tablespoons unsalted butter, at room temperature; 4 tablespoons finely grated Parmesan; 3 tablespoons all-purpose flour; Pinch cayenne pepper; 1 cup whole milk, heated; 1 cup lightly packed coarsely grated Gruyere cheese; 1 tablespoon Dijon mustard; 1/2 teaspoon kosher salt; 1/4 teaspoon freshly ground black pepper; 4 large egg yolks plus 5 large egg whites; Pinch cream of tartar