Preheat oven to 200 degrees
Mix your melted butter, Worcestershire sauce, garlic salt, onion powder, season salt together in a bowl. Set aside
Add all cereals, crackers, nuts and pretzels to a large baking pan
Drizzle melted butter mixture over top of cereal mixture
Mix well, but be careful not to break up the cereal (be sure to mix really good in the bottom of the pan!)
Bake at 200 for 15 minutes, remove from the oven and stir again
Bake at 200 for 2 more 15 minute intervals, stirring between each interval.
Turn off oven and leave party mix in oven while it cools.