Preheat oven to 350°F.
Line cookie sheets with parchment paper.
In a stand mixer, or using a hand mixer, beat the shortening and sugar together until creamy.
Beat in eggs and vanilla.
Add flour, cinnamon, salt, and baking soda, and mix on low speed until just combined.
Crush ⅓ cup of cereal.
Break ⅓ cup of cereal into pieces.
Fold crushed cereal, broken cereal and remaining ⅓ cup of whole cereal into the cookie dough.
Drop cookie dough by scoops onto prepared pans.
Bake in preheated oven for 10-12 minutes. Do not over-bake, cookies will still look slightly wet in center.
Allow to cool for 1 minute on the pan before transferring to cooling rack to cool completely.