Line a large sheet pan with parchment paper and set aside. Break pretzels in half.
In a large bowl, combine the Chex cereal, pretzels, Cap’n Crunch, Cheerios, and M&M’s. Stir until evenly mixed.
In a microwave-safe bowl, add white chocolate chips and vegetable oil. Microwave for 30 seconds, stir, then microwave for another 25 seconds. Stir until smooth. If needed, microwave in 10-second bursts, stirring between each until melted.
Pour melted chocolate over the snack mix. Stir gently until everything is coated. Work quickly, as the white chocolate will start to set. Spread the mix evenly on the prepared sheet pan. If using, sprinkle with Christmas sprinkles before the chocolate sets.
Let the chocolate set at room temperature or refrigerate for 10–20 minutes until firm. Once set, break into pieces and serve.
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Notes
Storage: Store Christmas Snack Mix in a sealed container at room temperature for up to a week, best enjoyed within 2–4 days. For longer storage, freeze leftovers in a sealed container or bag for up to 3 months and thaw at room temperature.