In a large mixing bowl combine 4 cups of the Golden Grahams and all of the rice Chex cereal. Gently stir and set the cereal aside.
In a medium microwave-safe bowl, add the chocolate chips and peanut butter. Stir the mixture and place the bowl in the microwave for 30 seconds.
Carefully remove from the microwave, stir, and heat for another 30 seconds. Repeat until the chocolate and peanut butter mixture is fully melted.
Add half of the mini marshmallows to the melted chocolate mix and stir. Pour the chocolate over the cereal and mix well until the cereal is coated.
Add the powdered sugar into a gallon size freezer bag. Pour the cereal mix into the freezer bag. Seal the bag and shake the mixture until it is coated in powdered sugar. Add in the remaining Golden Grahams and mini marshmallows and shake again to combine the snack mix.
Spread the smores snack mix onto a large baking sheet lined with parchment paper. Allow to cool for 5-10 minutes and enjoy