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For the Crust, mix all ingredients in medium bowl. Press into bottom and up sides of 9-inch pie plate. Set aside.
For the Filling, bring cream just to boil in small saucepan. Pour over chocolate in medium heatproof bowl. Let stand 1 minute then stir until smooth. Stir in cinnamon and 1 teaspoon of the vanilla. Pour into prepared crust. Refrigerate 30 minutes or until chocolate is firm. (Freeze 15 minutes for faster chilling.)
Beat marshmallow creme, cream cheese and remaining 1 tablespoon vanilla in large bowl with electric mixer on medium speed until well blended. Gently stir in whipped topping until well blended. Spread evenly over chocolate layer in crust.
Refrigerate at least 2 hours or until ready to serve. Garnish with chocolate curls or toasted marshmallows, if desired.