This is the OLD Chex Mix recipe that used to be on the side of the Chex box. They have since changed it, and it's not as good. Also tastes much better than the store bought Chex Mix. We always took this on family car trips growing up and we still have this at the family Campout every year. I think my mom sends it with all of the kids when they have to travel for sporting events.
Use a big bowl (sorry I'm unclear on the size) and fill with equal parts Cheerios, Crispix, Rice Chex, Corn Chex, and Wheat Chex.
1 square margarine
3 Tbl. worchestershire sauce
2 1/2 tsp. seasoning salt
Pour evenly over cereal, stirring to coat evenly. Microwave for 6 minutes, stirring every 2 minutes.