In a large bowl, cream together the butter and sugar until light and fluffy. Add the eggs and vanilla, beat until combined.
In a small bowl, whisk together the flour and cocoa powder. Add the dry ingredients to the wet ingredients, beat until combined, scraping down the sides as needed. The batter will be thick.
Preheat your waffle iron and spray with non-stick cooking spray. Using a small cookie scoop, place the batter into each waffle grid and lower the lid. Cook approximately 1-2 minutes.
Carefully remove cookies with a fork to a wire rack for cooling.
Once cooled, frost cookies with chocolate frosting or Nutella chocolate hazelnut spread, Enjoy!