Preheat the oven to 200°F. Line a rimmed baking sheet with parchment paper. Set aside.
In a large bowl, combine the Chex cereal, pretzels, Cheerios and peanuts, toss lightly to mix. Set aside.
In a small saucepan over low heat, combine the butter, honey, brown sugar, vanilla and salt.
Whisk until melted and blended. Pour the hot mixture over the snack mix. Toss to combine until all pieces are covered.
Bake the snack mix for 1 hour, removing every 15 minutes to flip the snack mix. Remove and allow to cool.
After the snack mix cools, move to a large bowl. Some pieces might be stuck together, gently break apart with your hands. Add the Reeses pieces and autumn mix.
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