Preheat oven to 250°F
Place butter in the bottom of a large roasting pan. Put in oven until butter is melted.
Add the Worcestershire sauce, seasoned salt, and garlic and onion powders to the melted butter and stir to combine.
Stir in Chex cereals, peanuts, pretzels and cheese crackers until everything is coated with the spiced butter mixture.
Bake the cereal mixture for an hour, stirring every 15 minutes.
Spread baked Chex mix out over wax paper and allow to cool completely before placing in an airtight container to store.