Good-Cooking - Chocolate Velvet Cheesecake

Ingredients

• 1 cup vanilla wafer crumbs
• 1/2 cup chopped pecans
• 3 tablespoons granulated sugar
• 1/4 cup margarine, melted
• 16 ounces cream cheese, softened
• 1/2 cup packed brown sugar
• 2 eggs
• 6 ounces semisweet chocolate chips, melted
• 3 tablespoons almond-flavored liqueur
• 2 cups sour cream
• 2 tablespoons granulated sugar