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/low heat.
Add the marshmallows, sweetened condensed milk, and peanut butter chips to the saucepan and stir well.
Continue cooking over medium/low heat (for approximately 5 minutes), stirring frequently.
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!