Place flour and butter in a food processor; cover and process until mixture resembles coarse crumbs. Add 1 cup cashews; pulse a few times until combined.
Press into a greased 13-in. x 9-in. x 2-in. baking dish. Bake at 350° for 25-28 minutes or until golden brown. Cool completely on a wire rack.
In a small mixing bowl, beat the cream cheese, peanut butter and confectioners' sugar until smooth. Fold in 1 cup whipped topping. Spoon over crust.
In another bowl, whisk milk and both pudding mixes for 2 minutes. Let stand for 2 minutes or until soft-set. Spread over cream cheese layer. Top with remaining whipped topping. Sprinkle with chopped candy bar and remaining cashews.
Cover and refrigerate for at least 1 hour before serving.