To make the Peanut Butter Topping: Using the Power Chef fitted with blade attachment, add powdered sugar, graham crackers and salt, cover and pull cord until fine crumbs. Set aside.
In the Whip 'N Mix Chef, add peanut butter, cover and blend on gear II until creamy.
Add half of the graham cracker mixture into the Whip 'N Mix Chef and mix on gear II until mixture is combined.
Scrape down sides, add remaining graham cracker mixture, vanilla extract and melted butter. Mix on gear II until fully combined.
Pour peanut butter mixture on top of chocolate spread in Silicone Rectangular Form and spread evenly.
Refrigerate for 20 min. or until mixture sets.
Unmold, cut into 15 pieces and serve.