Grease a 9 x 9 pan with cooking spray and set aside.
In a large pot over medium heat, melt the butter.
Add the regular marshmallows and salt and stir with a rubber spatula, scraping down the sides to make sure the marshmallows do not burn. As soon as the marshmallows are melted, remove from the heat immediately.
In a large bowl, add the Golden Grahams cereal and pour the marshmallow mixture of the cereal, using a rubber spatula to fold everything together.
Stir in the chocolate and mini marshmallows.
Spoon the mixture into the prepared pan, pressing down into an even layer.
Place in the fridge to set for at least 20 minutes. Once set, use a sharp knife to cut the s’mores bars into 12 rectangles. Enjoy!
