Add cereals, pretzels, cheerios, and peanuts to a 6 quart crockpot.
In a separate bowl, combine butter and seasoned salt until salt is dissolved. Stir in the Worcestershire sauce until just combined.
Drizzle the sauce evenly over the cereal. Toss gently until cereal is evenly coated.
Place a paper towel over top of cooker and cover with lid. Cook on low for 3 hours, stirring at 1 hour, 2 hours, and 2.5 hours to prevent burning.
Spread the mixture onto parchment covered baking sheets until it cools to room temperature.
Store in an airtight container for up to 3 weeks.