Step 1

In a small bowl, combine sour cream and 1/4 cup sugar. Gently spread over cookies. Cool completely. Cover and chill for at least 3 hours. Cut into bars.* Before serving, sprinkle with nutmeg and/or chocolate curls. Makes 24 to 36 bars.

Step 2

Preheat oven to 325 degrees F. Lightly grease a 13x9x2-inch baking pan; set aside. In a medium bowl, combine graham cracker crumbs and 1/4 cup sugar. Stir in the 1/3 cup melted butter. Press mixture evenly into bottom of the prepared baking pan; set aside.

Step 3

In a large bowl, combine cream cheese and the 1-3/4 cups sugar. Beat with an electric mixer on medium speed until smooth. Add eggs, one at a time, beating on low speed after each addition just until combined. Beat in pumpkin, pumpkin pie spice, vanilla, and salt on low speed just until combined. Remove 1-1/4 cups of the mixture.

Step 4

In a small heavy saucepan, combine the 6 ounces chocolate and the 2 tablespoons butter. Cook and stir over low heat until melted. Whisk chocolate mixture into the 1-1/4 cups pumpkin mixture. Pour over crust, spreading evenly. Bake for 15 minutes.

Step 5

Carefully pour the remaining pumpkin mixture over baked chocolate layer, spreading evenly. Bake for 40 to 45 minutes more or until filling is puffed and center is set. Cool on a wire rack for 30 minutes.