I was looking for a good afternoon snack and it was right on the side of the Chex box.  It only takes a microwave and a couple of minutes.  Here is the recipe.

Ingredients
1/4 cup sugar

1    teaspoon ground cinnamon

2    cups Cinnamon Chex® cereal

2    cups Chocolate Chex® cereal
4    cups popped popcorn
1/4 cup margarine

Directions
1. In small bowl, mix sugar and cinnamon; set aside. In large microwavable bowl, mix cereals and popcorn.
2. In 1-cup microwavable measuring cup, microwave butter uncovered on High about 40 seconds or until melted. Pour over cereal mixture, stirring until evenly coated.
3. Microwave uncovered on High 2 minutes, stirring after 1 minute. Sprinkle half of the sugar mixture evenly over cereal mixture; stir. Sprinkle with remaining sugar mixture; stir. Microwave 1 minute longer. Spread on waxed paper or paper towels to cool. Store in airtight container.