Preheat oven to 250 degrees. Add the Chex, pretzels, rye chips, Cheerios, and mixed nuts together in a large mixing bowl, and gently stir a bit to combine.
In a separate bowl, whisk together the melted butter, Worcestershire sauce, dark soy sauce, seasoned salt, cajun seasoning and garlic powder together until combined. Drizzle half of the sauce evenly over the Chex mix. Then give the mix a gentle stir to combine. (I like to stir with a rubber spatula, to help prevent breaking the Chex.) Repeat by drizzling the remaining sauce over the Chex mix, and stir again until combined.
Spread Chex mix onto dry baking sheet. Bake for 1 hour, stirring Chex mix every 15 minutes.
Spread the mix out on parchment paper or paper towels until it has cooled to room temperature. Store in airtight container for up to 3 weeks.
