Preheat oven to 350 degrees. Grease cookie sheets or line them with parchment paper; set aside.
In a large bowl, cream butter, sugars and vanilla together until light and fluffy and sugar is completely dissolved. Add eggs, one at a time, beating well with each addition. Combine flour, cocoa powder, baking soda and cinnamon; mix well and gradually stir into creamed mixture. Fold in rolled oats, crushed banana chips, raisins and pecans.
Drop by rounded teaspoonfuls onto prepared cookie sheets. Bake for 12 to 15 minutes. Remove cookies from oven and transfer to a wire rack. Cool completely.