Preheat oven to 350 degrees. Grease 2 standard donut pans (click here to purchase) and set aside. In a large mixing bowl, combine all of the dry ingredients (flour, brown sugar, baking cocoa, baking powder, and salt). Then set aside. In a medium sized mixing bowl, combine all of the wet ingredients (eggs, milk, vanilla, and vegetable oil). Then add the wet ingredients to the dry ingredients and stir until combined. Add chocolate chips and mix. Then, using a spoon, distribute the batter between the greased donut pans (they should be about 3/4 of the way full). Bake 15 minutes. Remove from the oven to cool. After about a minute of cooling, carefully loosen the donuts from the pan and move to a cooling rack.
