Spray a 9 x 9 inch dish with non-stick cooking spray.

Place the Rice Krispies and Chex in a bowl and combine.

In a sauce pan, combine the peanut butter, corn syrup, brown sugar, sugar, cinnamon, and vanilla.

Cook over low heat until all is well combined and sugars have dissolved. This will take a minute or two.

Pour mixture of cereals and combine until cereal is well coated.

Pour mixture into the prepared 9 x 9 pan and press into the pan. Let cool for 5 minutes.

Place the chocolate chips and shortening in a microwave safe bowl. Microwave for 15 - 30 seconds until melted and smooth. Drizzle or pipe the chocolate over the cooled bars. Serves 12.