Line a large baking sheet with parchment paper and set aside.
In a large bowl mix together chex and golden grahams.
Add confectioners' sugar into a large resealable bag.
In a large microwave-safe bowl melt chocolate chips and peanut butter in 30 second intervals, stirring in between until melted and creamy.
Stir in vanilla extract and mini marshmallows.
Add cereal to melted chocolate and gently mix until combined.
Add mixture to bag with powdered sugar. Seal and shake until coated.
Pour mixture onto a large baking sheet lined with parchment paper. Gently toss in remaining mix ins - Reese's peanut butter cups, Golden Grahams, and mini marshmallows. Let sit for 15-20 minutes.
Store in a container with a lid.