In a small ziplock baggie combine cinnamon and sugar and set aside.
In a heavy saucepan over medium heat, heat brown sugar, butter, and corn syrup until the mixture comes to a boil. Let boil for one minute, stirring constantly, then remove from heat.
Pour over cereal and stir until cereal is coated.
Then mix in ¾ cup of cinnamon sugar and mix well.
Spread cereal on prepared baking sheet. Sprinkle the rest of the cinnamon/sugar mixture on top. Bake for about 5 minutes, then flip with a spatula and bake for 3 more minutes, until cereal turns golden brown. Remove from oven and let cool completely, then break up and store in an airtight container.