Preheat your oven to 250°F (120°C). Line a baking sheet with parchment paper if desired.
In a large mixing bowl, combine the Rice Chex, Corn Chex, pretzel twists, mixed nuts, and bagel chips. Mix well.
In a separate bowl, whisk together the dill pickle juice, melted butter, dill weed, garlic powder, onion powder, paprika, cayenne pepper (if using), and salt until well combined.
Pour the liquid mixture over the Chex mix, ensuring everything is evenly coated. Stir gently to combine.
Spread the mixture evenly on the prepared baking sheet.
Bake in the preheated oven for 30 minutes, stirring every 10 minutes to ensure even toasting.
Remove from the oven and let the mix cool completely before serving.