01 - Line a large baking sheet with parchment paper to create a nonstick surface.
02 - In a large mixing bowl, thoroughly combine crispy rice cereal squares, corn cereal squares, pretzels, salted peanuts, cheese crackers, mini chocolate-coated candies, and mini marshmallows.
03 - Place white chocolate chips and coconut oil or shortening (if using) in a microwave-safe bowl. Microwave in 30-second intervals, stirring between bursts, until melted and smooth.
04 - Immediately pour the melted white chocolate over the dry mixture, using a spatula to gently fold until every piece is thoroughly coated.
05 - Evenly spread the coated mixture onto the prepared baking sheet in a single layer. Allow to cool at room temperature for approximately 20 minutes until fully set.
06 - Break cooled snack mix into chunks and transfer to an airtight container. Store at room temperature for up to one week.