Preheat your oven to 250°F (120°C).

In a large mixing bowl, combine the pretzels, roasted peanuts, cheddar cheese crackers, rice cereal squares, corn cereal squares, and sunflower seeds.

In a small bowl, whisk together the vegetable oil and ranch seasoning mix until fully combined.

Drizzle the ranch seasoning mixture over the trail mix ingredients and toss well to evenly coat everything.

Spread the coated trail mix onto a large baking sheet in an even layer.

Bake in the preheated oven for 15 minutes, stirring halfway through to ensure even baking.

Remove from the oven and allow the trail mix to cool completely on the baking sheet.

Once cooled, transfer the Ranch Trail Mix Snack Mix to an airtight container for storage or serve immediately.