Heat oven to 250.
In a large bowl mix the melted butter, Worcestershire and garlic powder until thoroughly combined.
Fold in the Chex, O's, peanuts, sesame sticks and pretzels until evenly coated in the butter mixture.
Divide the mix among 3 rimmed large metal baking pans, spreading the mix into one layer.
Bake for about 1 hour, stirring the mix and rotating the pans every 15 minutes. (You will need to use 2 rows of oven racks in order to fit all 3 pans.)
When the mix is lightly golden brown and crispy, pull out of the oven and cool completely on paper towels—the paper towels will absorb some of the extra butter. Store in an airtight container.