Load the crock pot. Gently mix together the Chex, Cheez-its, pretzel twists, and nuts. Add the mixture to the crockpot.
Season. Whisk together the butter, Worcestershire sauce, and garlic powder. Gently fold the butter mixture into the Chex mixture.
Cook. Place a clean, dry dish towel over the crock pot followed by the lid. Cook on low for 2 hours and 45 minutes. Be sure to stir every 30 minutes or so to prevent burning.
Dry. Spread the Chex mix over a sheet pan and let it sit for 30 minutes to an hour. It will crisp up during that time.