Preheat your oven to 275°F (135°C). Line a large, rimmed baking sheet with parchment paper or a silicone baking mat.
In an extra-large mixing bowl, combine the peanut butter cereal, wheat cereal, honey nut cereal, pretzels, and cheddar cheese crackers. Toss gently to distribute.
In a small bowl, whisk together the melted unsalted butter, packed light brown sugar, maple syrup, kosher salt, and ground cinnamon until the mixture is smooth and the sugar begins to dissolve.
Pour the glaze over the cereal mixture. Use a large rubber spatula to fold the mix until every piece is thoroughly and evenly coated with the glaze.
Spread the mixture out in an even layer on the prepared baking sheet.
Bake for 25 to 30 minutes. Critically, remove the pan every 10 minutes to stir the mix thoroughly; this prevents the sugar from scorching and ensures a uniform crunch.
Remove from the oven and allow the mixture to cool completely on the pan. The glaze will harden and become crunchy as it cools.
Once fully cooled to room temperature, transfer the mix to a bowl and stir in the halal mini marshmallows, candy corn, and peanut butter candy pieces.
Serve immediately or store in an airtight container at room temperature for up to 7 days.