This recipe won second place in out 2017 Iowa State Fair Sweet Snack Mix Contest.
Preheat oven to 325°F, and line a baking sheet with aluminum foil.
Combine the cereal, pretzels, and peanuts in a large bowl. Drizzle melted butter over the dry ingredients, and stir to coat.
Combine sugar, cinnamon sugar, cinnamon, and sea salt in a large resealable (ziplock) bag. Stir or shake the bag to combine spices well. Transfer the pretzels-cereal-peanut mixture to the spice bag. Close the bag and shake to coat crunchy pieces with the sugar mixture.
Spread mixture out onto a single layer on the baking sheet. Bake snack mix in oven for 7-8 minutes. Allow to cool completely on the baking sheet before serving or storing in airtight container.