Preheat oven to 375 degrees.
In a mixing bowl, combine your while whole wheat flour, sugar, cocoa powder, baking soda and baking powder. Set aside.
In a separate bowl, combine vanilla, egg, Greek yogurt, milk and oil.
Combine wet and dry ingredients, as well as chocolate chips if using, and mix until just combined.
Transfer batter into a large freezer style bag (or piping bag). Batter will be thick.
Pipe your batter into a greased donut pan.
Bake for approximately 10-12 minutes until the tops of donuts spring back when touched.