Thoroughly prepare a 9x13 baking pan by lining it with aluminum foil. Ensure the foil is applied smoothly and then spray with a non-stick cooking spray.

In a microwave-safe bowl, combine the chocolate chips, either the butterscotch or peanut butter chips, and half of the divided peanut butter.

Utilize a microwave to melt the ingredients. Do this by heating them in 30-second intervals, stirring in between, until a smooth mixture is achieved.

Transfer half of the melted mixture into the previously prepared baking pan, ensuring an even layer.

Once spread, refrigerate the pan to allow the layer to set while preparing the next layer.

In a medium-sized saucepan, combine butter, sugar, and evaporated milk.

Place over medium heat, stirring occasionally until the sugar has fully dissolved and the butter is completely melted.

Allow the mixture to come to a boil, maintaining the boil for 5 minutes.

After boiling, remove from heat and incorporate the marshmallow cream, the remaining peanut butter, and the salted peanuts, ensuring a consistent mixture.

Pour the recently prepared mixture over the set chocolate layer in the baking pan, ensuring an even spread.

Return the baking pan to the refrigerator, allowing the newly added layer to solidify.

Unpack the caramels and place them into a separate microwave-safe bowl, adding 1 tablespoon of water.

Melt the caramels in the microwave, checking and stirring periodically. If the caramels are too thick, introduce water in small increments until the desired consistency is achieved.

If the reserved chocolate and peanut butter mixture has solidified, it may be necessary to gently reheat it in the microwave to regain a malleable consistency.

Once reheated, pour this mixture over the caramel layer in the baking pan and spread evenly.

For the final time, place the baking pan in the refrigerator to allow the entire composition to solidify.

Once set, use the foil to carefully lift the fudge out of the pan.

Using a sharp knife, divide the fudge into uniform 1-inch squares.

Optionally, these squares can be placed into mini muffin papers for presentation.

Serve as desired.