In a medium sized bowl, melt butter completely. Add in Worcestershire sauce, garlic powder, onion powder, and seasoning salt. Stir until well combined
In a large bowl, combine rice Chex, corn Chex, cheerios, and pretzels.
Pour on butter mixture and toss until the Chex mix is well coated.
Spread the mixture out on a baking pan. There is no need to grease the pan or use parchment paper as the butter will keep it from sticking.
Bake for 40-60 minutes. Stirring the mixture every 20 minutes. You will know it is done baking when the Chex mix is crispy and no longer wet from the butter.
Scoop into a serving dish and enjoy!
Video
Notes
Stir the mixture every 20 minutes to prevent burning. If your oven does not go as low as 250 degrees, then decrease the total baking time and watch it closely to ensure it doesn't burn.
Make sure the mixture cools completely before storing in an airtight container.
Other tasty add-ins: goldfish, Cheez-its, oyster crackers, or bagel chips.