Lightly spray 9×13 baking pan with cooking spray.
Over medium heat, melt milk chocolate chips, peanut butter, and butterscotch chips in small saucepan.
Stir together until completely melted and smooth, then pour into the baking pan. Spread the mixture evenly with a spatula, then refrigerate until set.
Second Layer Prep:
Melt butter over medium-high heat in saucepan.
Add sugar and evaporated milk and bring to boil.
Cook for 5 minutes, stirring constantly.
Remove from the heat and quickly mix in marshmallow creme, peanut butter, and vanilla.
Add peanuts to mixture and spread evenly over chocolate layer.
Refrigerate until set.
Third Layer Prep:
Melt caramels and heavy cream over low heat until smooth.
Pour over peanut mixture and refrigerate until set.
Fourth Layer Prep:
Repeat step one.
Melt chocolate chips, butterscotch chips, and peanut butter over low heat until smooth.
Pour over caramel layer and refrigerate for at least one hour before cutting.
