First, get your cereal ready for coating. Pour 5 cups of the Apple Cinnamon Chex cereal into one medium-sized bowl and the remaining 5 cups into a second medium-sized bowl. Setting them up separately makes the next steps much easier.
Next, prepare your dry coating. You will need two large resealable plastic bags. In each bag, combine 1/2 cup of the vanilla cake mix, 1 cup of granola, and 1 teaspoon of ground cinnamon. Shake each bag gently to mix the ingredients.
In two separate microwave-safe bowls, melt your candy melts. Place the green candy melts with 1 teaspoon of shortening in one bowl and the lime green melts with 1 teaspoon of shortening in the other. Microwave in 30-second intervals, stirring in between, until smooth.
Now, it's time to bring it all together. Pour the melted green candy mixture over one bowl of Chex cereal and the lime green mixture over the other. Stir each bowl gently with a spatula until all the cereal pieces are evenly coated.
Carefully transfer the green-coated cereal into one of the prepared bags with the cake mix mixture. Pour the lime green-coated cereal into the second bag. Seal both bags securely and shake well until every piece is covered. Finally, pour both mixtures into a large serving bowl, drizzle with warm caramel topping, and gently toss to combine.