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Preheat oven to 350°F. Lightly grease cookie sheets; set aside. In a very large mixing bowl beat shortening and butter with an electric mixer on medium speed for 30 seconds. Add granulated sugar, brown sugar, baking powder, salt, and baking soda. Beat until combined, scraping sides of bowl occasionally.
Add eggs and vanilla. Beat until combined. Beat in as much of the flour and the cocoa powder as you can with the mixer. Using a wooden spoon, stir in any remaining flour, the oats, semisweet chocolate pieces, white baking pieces, and nuts.
Drop dough by rounded teaspoons 1 inch apart onto prepared cookie sheets. Bake for 8 or 9 minutes or until edges are set. Cool on cookie sheets for 1 minute. Transfer to wire racks; cool.