Preheat the oven to 250 degrees.
In a large bowl, mix together the cereals and set aside.
In a roasting pan (or a rimmed cookie sheet), add the butter and melt in the oven. Remove the pan from the oven and stir the Worcestershire and spices into the butter.
Pour the cereal into the butter mixture and toss until evenly coated. Spread into an even layer.
Bake for one hour, stirring every 15 minutes. Remove from the oven and spread the Chex Mix in a single layer on paper towels. Let it cool completely and then store in an airtight container.