Fire up your smoker for cooking at 250 F. Add only one small piece of light wood, such as apple or peach. If you are using a smoker that has a water pan, such as the Weber Smokey Mountain, do not fill the pan with water.
Combine the cereals, pretzels, nuts and bagel chips in a large bowl.
Melt the butter in a small saucepan. Add the Worcestershire sauce and stir.
Combine the seasoned salt, garlic powder and onion powder and slowly whisk into the melted butter.
Drizzle the butter mixture over the cereal and gently toss to coat.
Place into a disposable 9" x 13" deep aluminum pan and place on the top rack of the smoker.
Smoke for 1 hour or until the mixture turns golden brown, stirring every 15 minutes.
Remove and let cool completely before serving, or store for up to 2 weeks.