Good-Cooking - Orange Chocolate Cheesecake

Ingredients

• 2 cups vanilla wafer crumbs
• 6 tablespoons butter, melted
• 1/4 cup granulated sugar
• 32 ounces cream cheese, softened
• 1 cup granulated sugar
• 4 eggs
• 1 cup (8 ounces) sour cream
• 10 (1 ounce) squares white baking chocolate, melted
• 1 cup (8 ounce) sour cream
• 3 tablespoons granulated sugar
• 1/2 to 1 teaspoon orange extract
• 2 (11 ounce) cans mandarin oranges, well drained