Brownie Swirl Cheesecake

Ingredients

• 8 ounces bittersweet or semisweet chocolate
• 1 cup unsalted butter
• 1 1/2 cups all-purpose flour
• 1 teaspoon salt
• 6 extra-large eggs
• 2 cups sugar
• 1 tablespoon pure vanilla extract
• three 8-ounce packages cream cheese (use only full fat), at room temperature
• 1 1/3 cups sugar
• 3 tablespoons cornstarch
• 1 tablespoon pure vanilla extract
• 2 extra-large eggs
• 2/3 cup heavy or whipping cream, plus 1 tablespoon for brushing
• 2 ounces bittersweet or semisweet chocolate
• 1 cup coarsely chopped walnuts