Preheat oven to 350 degrees F. Line a baking sheet with parchment paper or a Silpat. Set aside.
In a medium bowl, sift flour, baking soda, salt, and cocoa. Set aside.
With a mixer, cream butter and sugars together until smooth. Add in eggs, one at a time. Next, add in vanilla extract. Mix until blended.
Slowly add flour mixture to sugar mixture and mix until flour disappears. Stir in chocolate chips, mint green chips, and chopped Cool Mint Oreos. Drop cookie dough by rounded tablespoons onto prepared baking sheet, about 2 inches apart.
Bake cookies for 10 minutes, or until the cookies are set around the edges, but still soft in the center. Don't over bake. Remove from oven and let sit on baking sheet for 3-5 minutes. Move to a cooling rack and cool completely.