Preheat oven to 300 degrees F. In a large bowl, combine the butter, Worcestershire, sesame seeds, poppy seeds, parsley, chives, dill, garlic powder, onion powder, salt, and pepper. Add the pretzels, cheese crackers, and Chex, tossing well for 3-5 minutes or until the mixture is evenly coated. Spread the mix evenly over a rimmed baking sheet.Transfer to the oven and bake 30-35 minutes, Toss 1-2 times throughout cooking. Serve, or store in an airtight container for up to 1 week.