The first step in making these chocolate sugar cookies is to mix together your dry ingredients. In a large bowl, whisk together the flour, cocoa powder, baking soda, and salt. I’ve learned that it’s really important to make sure your dry ingredients are mixed together thoroughly, so don’t skip this step. It helps ensure that the cocoa powder is evenly distributed and that you won’t have any clumps in your dough. Plus, the baking soda and salt will be spread throughout, which will help the cookies bake up perfectly.