Preheat your oven to 250 degrees Fahrenheit. Line a rimmed baking sheet with parchment paper. (See post for details about cooking in slow cooker.) In a large bowl, combine the dry ingredients - cereal, pretzels, and crackers.
9 cups Chex cereal, 1 cup small pretzels, 1 cup cheese crackers
In a glass measuring cup, combine the melted butter, ranch mix, and Worcestershire sauce. Whisk to combine well.
6 tablespoons unsalted butter, 3 tablespoons dry ranch seasoning, 1 tablespoon Worcestershire sauce
Pour the wet ingredients over the dry ingredients and mix well. Pour onto the prepared baking sheet. Make sure to scrape down the bowl with a spatula adding any remnants to the baking sheet.
Bake for 1 hour, tossing the ingredients on the tray every 15 mintues. Remove when the ingredients are golden brown and crisp.
Serve right away, or wait to cool and then store in an airtight container for up to a week.