Spray a 13" x 9" baking dish with baking spray.
Add one jar of the dry roasted peanuts in an even layer in the bottom of the sprayed dish. Set aside.
In a large saucepan, melt the butter over medium heat.
Add the marshmallows, sweetened condensed milk, and peanut butter chips to the saucepan and stir well.
Continue cooking over the medium heat, stirring frequently, until the mixture is thoroughly blended and the marshmallows and peanut butter chips have melted.
Remove from the heat and add the salt and vanilla extract. Stir well.
Gently pour the marshmallow mix evenly over the peanut layer in the prepared pan, using a spatula to even out the marshmallow mixture if needed.
Sprinkle the remaining dry roasted peanuts over the marshmallow mixture, pressing them lightly into the filling.
Cover and refrigerate at least 4 hours.
Cut into bars, serve and enjoy!