Preheat oven to 250 and set two racks in the center of the oven.
Combine the melted butter with all of the seasoning, and set aside while you toss the snack mix together.
In a very large bowl, throw all the cereals, pretzels, crackers and cashews together and mix. Slowly pour 1/2 of the butter mixture over the snacks, and toss to combine. Finish by adding the rest of the melted butter and seasoning, making sure to mix very thoroughly - doing this in two stages helps to ensure a more even coating of the good stuff!
Spread the snack mix between two large baking sheets, and bake in the oven at 250 degrees for one hour, stopping to stir and rotate the pans 1/2 way through.
Cool and store at room temp in an airtight container - lasts for a week, if it doesn't disappear immediately!