Triple Chocolate Cookies

I intended to bring these into work for a mid-week treat, but they were so good that I kept most of them for myself. They are very close to Specialty's black and white cookies. Next time I try this recipe, I will make big balls of dough and refrigerate before baking so I can more closely mimic the Specialty's cookies. 

Ingredients
1 cup flour
1/2 cup cocoa powder
1/2 teaspoon baking soda
1/4 teaspoon baking powder
1/8 teaspoon salt
1/2 cup margarine, softened
1/2 cup granulated sugar
1/2 cup brown sugar
1 egg
1 teaspoon vanilla extract
1/2 cup chocolate chips
1/2 cup white chocolate chips

Instructions
Preheat oven to 350 degrees.
Sift together flour, cocoa powder, baking soda, baking powder, and salt. Set aside.
Cream together butter and sugars. Add egg and vanilla extract and mix well. Stir in both kinds of chocolate chips.
Drop tablespoonfuls of dough onto cookie sheets.
Bake for 12 to 14 minutes. Cool on a wire rack.
Yields 2 dozen