Add the cereals and pretzels to a large mixing bowl.

In a small bowl, whisk together the olive oil, pickle juice, dill, and garlic salt.

Pour mixture over the cereal and pretzels and stir to coat.

Microwave for 3 minutes, stirring every 60 seconds.

Add the cashews and popcorn to the bowl and stir well to combine.

Spread mixture onto a baking sheet to dry for 30 minutes.

Toss to combine and store tightly covered.