Name: Swirled Mascarpone Brownies with Hazelnuts
Ingredients: 1 1/2 cups unsalted butter; 12 ounces 60% cocoa bittersweet chocolate; 6 large eggs; 1 tablespoon plus 1 teaspoon McCormick's Pure Vanilla Extract; 1 2/3 cup sugar; 1 1/2 cup all-purpose flour; 1 teaspoon salt; 1 1/2 cups chopped hazelnuts (toasted); 1 egg yolk; 1 tablespoon flour; 2 tablespoons sugar; 8 ounces mascarpone cheese