Place maple cookies into the bowl of a food processor and grind into crumbs. Stir together with melted butter and press into 4-4 inch tart pans and refrigerate.
In a large bowl, whip cream. Set aside.
In another large bowl, whip cream cheese with maple syrup, vanilla, maple flavoring, sugar and sour cream until completely smooth. Be sure to scrape sides and whip again to ensure filling is completely smooth. Fold in whipped cream and spoon into chilled tart shells. Refrigerate 1-2 hours to set {or longer} and top with walnuts for garnish. Serve cold. *Lauren's Latest Original Recipe