Preheat oven to 250 degrees.
Line two baking sheets with parchment paper and set aside.
Combine Chex Cereals, pretzels, and peanuts in a large bowl.
Place butter, worcestershire sauce, brown sugar, garlic salt, black pepper, onion powder and paprika in a microwave safe bowl. Melt in the microwave, stirring every 20 seconds until completely melted.
Pour sauce mixture over the cereal mixture and gently stir with a rubber spatula to coat well.
Spread onto your prepared baking sheets.
Bake for 45 - 60 minutes, stirring every 10 - 15 minutes.
Remove from the oven and allow to cool. Store in an airtight container for up to two weeks.