Begin by lining a 9x13 inch pan with either foil or parchment paper, ensuring it is lightly coated with non-stick cooking spray. Proceed to melt the chocolate chips and peanut butter together in a microwave-safe bowl at 50% power. The initial heating should last for one minute, followed by stirring. Continue this process in 30-second intervals until the mixture is fully melted.

Once melted, evenly distribute the chocolate mixture into the prepared pan. This should then be placed in the refrigerator for approximately 20 minutes to allow for solidification.

Utilize a medium-sized saucepan to melt the butter over medium heat. Following this, incorporate the sugar and milk, stirring continuously until the sugar is completely dissolved. Bring this mixture to a boil and allow it to cook for five minutes with occasional stirring. Subsequently, add the marshmallow fluff, peanut butter, and vanilla extract, stirring until the mixture attains a smooth consistency.

Remove the saucepan from the heat. Fold in the chopped peanuts, then spread this nougat filling over the previously prepared chocolate layer. This should be left to cool thoroughly.

In a microwave-safe bowl, combine the caramels and whipping cream. Microwave at 50% power for 30 seconds, then stir. Continue this process in 30-second intervals until the caramel is smooth and thoroughly melted. An alternative method is to melt the caramel and cream over low heat in a saucepan. Once melted, pour this over the nougat layer and allow it to cool completely.

Melt the remaining chocolate chips and peanut butter in a microwave-safe bowl using the previously mentioned method (50% power, stirring at 30-second intervals). Once melted, pour this final layer over the caramel layer, spreading it to form an even coating.

Refrigerate the pan for a minimum of one hour or until the mixture is firm. After firming, remove the entire square from the pan, gently peeling away the foil. The bars can then be cut into desired shapes and sizes.

The finished Snickers bars should be stored in a covered container, where they will remain fresh for up to one week.