Preheat oven to 250 degrees F.In large bowl, mix the chex cereals, mixed nuts, pretzels and bagel chips. Set aside.Melt the butter in a bowl and mix in the worcestershire sauce, seasoned salt, garlic powder, onion powder and a good pinch of pepper. Pour the butter over the cereal mixture, tossing well for 3-5 minutes or until the cereal mixture is evenly coated.Bake 1 hour, stirring every 15 minutes. Spread on paper towels to cool, about 15 minutes (or just start eating!!). Store in airtight container.