1. Preheat the oven to 350 degrees F and spray donut pans with cooking spray. Set asideIn a large bowl, combine butter, eggs, vanilla and brown sugar whisk until combined about 2 minutes.

2. In a large measuring cup or medium bowl, combine flour, baking powder, salt and cacao powder combine the ingredients with a fork.

3. Alternate between the dry ingredients and the milk folding them into the wet ingredients to combine. If you find the batter a bit too thick feel free to add a little bit of milk to reach your desired texture.

4. Add the mixture into the molds and bake for 12 minutes. Allow to cool completely on a wire rack.