Step 1

Preheat oven to 350 degrees F (175 degrees C).

Step 2

Beat brown sugar, white sugar, margarine, shortening, eggs, and vanilla extract together in a large bowl with an electric mixer until light and fluffy.

Step 3

Whisk flour, cocoa powder, baking soda, and salt together in a separate bowl; beat into sugar mixture until you have a dough. Stir chocolate chips and walnuts into dough. Drop rounded teaspoonfuls of dough 2 inches apart onto baking sheets.

Step 4

Bake in the preheated oven until golden and set, 8 to 10 minutes. Cool briefly on the baking sheets before transferring to wire racks to cool completely.