Brownie Mosaic Cheesecake

INGREDIENTS

• :
• 4 ounces unsweetened chocolate
• ¾ cup (1½ sticks) unsalted butter
• 1¾ cups sugar
• 3 eggs
• 1 teaspoon vanilla
• ½ teaspoon salt
• 1 cup flour
• 1½ cups or 5 ounces (3 cups or 10 ounces to double) finely ground Oreos, or other chocolate cookie
• 5 tablespoons (10 tablespoons to double) unsalted butter, melted
• 1/3 cup (2/3 cup to double) granulated sugar
• 1/8 teaspooon (¼ teaspoon to double) salt
• 3 (8-oz) packages of cream cheese, softened
• 1 cup granulated sugar
• 4 large eggs
• 3 oz. bittersweet chocolate, finely chopped
• 4 tablespoons (½ stick) unsalted butter
• ¼ cup heavy cream
• ½ teaspoon vanilla
• 1 tablespoon powdered sugar