Preheat your oven to 250°F (120°C).
In a large mixing bowl, combine Rice Chex, Corn Chex, pretzel sticks, and peanuts.
In a separate bowl, whisk together the melted butter, dill pickle seasoning, Worcestershire sauce, garlic powder, onion powder, and sea salt until smooth.
Pour the seasoned butter mixture over the cereal mixture and toss to coat evenly.
Spread the mixture evenly on a large baking sheet lined with parchment paper.
Bake in the preheated oven for 1 hour, stirring every 15 minutes for even toasting.
Remove from the oven and allow to cool completely.
Store in an airtight container at room temperature once fully cooled.