In a medium saucepan over medium heat, combine the chocolate, 3/4 cup of the Andes mints, chocolate syrup, butter and vanilla. Stir until smooth and fully combined.
Place the Chex cereal into a large mixing bowl (larger than you think you need) and pour the chocolate mixture over the cereal. Gently toss to coat. Do not stir- the pieces will break.
Put half of the powdered sugar into an airtight plastic bag along with half of the tacky cereal. Shake to fully coat.
Sift out onto a rimmed baking sheet to set. Repeat with the other half of the powdered sugar mixture and cereal mix.
Allow the snack mix to set for at least 1 hour before transfering to a plastic container. Gently mix with the remaining 1/4 cup of the roughly chopped Andes mints.
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Notes
*Use regular or Chocolate, but be advised that chocolate is actually a mix of chocolate coated and regular cereal, not all chocolate.