Preheat oven to 300. Line a baking sheet with parchment paper.
In a large bowl combine cereal, pretzels, and popcorn.
In a small bowl, mix melted butter, brown sugar, vanilla, and Member's Mark™ Pumpkin Pie Spice until thoroughly blended.
Pour mixture over the cereal/pretzel/popcorn mix; stir well to coat
Spread cereal mix onto prepared pan. Bake 30 minutes, stirring halfway through.
While the mix is cooking, use a marker with edible ink to draw skeleton and ghost faces on the mini marshmallows.
Remove mix from the oven and allow to cool completely.
Once cooled, mix with M&Ms, pumpkin spice morsels, and marshmallows.