Preheat the oven to 350°F. Line baking sheets with parchment paper or silicone liners and set aside.
In a large bowl, beat to combine the cake mix, eggs, and vegetable oil.
Scoop 1 1/2 Tablespoons of dough and roll into balls.
Place each ball of dough individually in the black cocoa powder and coat as desired. Cover completely for a full crinkle cookie look or coat sections for more of a brimstone look.
Place each cocoa-coated dough ball at least 2" apart on the prepared cookie sheets.
Bake for 10-12 minutes. Allow the cookies to cool for about 5 minutes on the baking sheet before moving to a cooling rack to cool fully.