I think most everyone has made these. They're very good. I hear that they are better if you use the Cinnamon-flavored Chex cereal. I haven't tried those for making these, yet. I know they are good all by themselves, though.
Recipe from Chex cereal
9 cups Rice Chex cereal
1 cup semi sweet chocolate chips
1/2 cup peanut butter
1/4 cup butter
1 tsp vanilla
1 1/2 cups pwd sugar
Pour the cereal in a large bowl and set aside. In a medium bowl, combine the chocolate chips, peanut butter, and butter. Microwave until the chocolate chips and butter are almost melted. Stir until completely melted. Stir in the vanilla, blend well. Pour the chocolate mixture over the cereal and stir until completely coated. Mix in the pwd sugar, stirring until completely coated. Store in an airtight container.