Get Ready: Preheat your oven to 275°F (135°C). Line two large baking sheets with parchment paper for easy cleanup.
Combine Dry Ingredients: In a very large bowl, gently mix together the corn Chex, rice Chex, pretzels, broken bagel chips, cheese crackers, and peanuts.
Prepare the Sauce: In a small saucepan, melt the butter over medium heat. Stir in the corn syrup, Worcestershire sauce, all the spices (ancho chile powder, hot smoked paprika, garlic powder, chipotle powder), brown sugar, salt, and pepper. Bring this mixture to a gentle simmer and cook for 2-3 minutes, allowing the flavors to meld.
Coat the Mix: Immediately pour the warm spice mixture over the dry snack ingredients in the large bowl. Stir everything thoroughly until every piece is well-coated. This ensures a delicious flavor in every bite!
Bake to Perfection: Divide the coated snack mix evenly between your two prepared baking sheets, spreading it out into a single, even layer.
Bake and Stir: Bake for 1 hour and 20 minutes. Be sure to stir the mix every 20 minutes, rotating the baking sheets from top to bottom and front to back each time you stir. This helps ensure even toasting and flavor.
Cool Down: Once baked, transfer the trays to wire racks and let the Chex mix cool completely. It will become wonderfully crisp as it cools!
Store & Enjoy: Once fully cooled, transfer the BBQ Chex Mix to a large gallon-size zip-top bag or an airtight container. It stays fresh and delicious for up to one week.