Gather all ingredients and preheat the oven to 250 degrees F (120 degrees C).

Heat butter, Worcestershire sauce, garlic salt, and celery salt over low heat in a medium saucepan until butter has melted.

Combine cereals, nuts, and pretzel sticks in a very large mixing bowl. Evenly pour butter mixture over top. Gently stir until evenly coated; transfer to a large roasting pan.

Bake in the preheated oven until golden and fragrant, about 2 hours, stirring gently every 15 minutes.

Let mix cool completely at room temperature, about 1 hour. Store in airtight containers or large resealable bags.