Gooey Chocolate Crinkle Cookies

1. Using an electric mixer or a stand mixer, mix the cocoa powder, both sugars, melted butter, and eggs. Mix for 2 minutes, until very glossy. Add the vanilla, flour, baking soda, salt, and chocolate chips, beating to combine. 2. Preheat oven to 350° F. Line a baking sheet with parchment paper. 3. Scoop the dough into rounded tablespoon-size balls. Place on the prepared baking sheet. Freeze for 10-20 minutes, until chilled. If using, roll each ball through granulated sugar. Then generously roll in powdered sugar and return to the baking sheets.4. Bake for 8-10 minutes or until the cookies start to set around the edges and crack. The centers should be doughy though. Let cool on the pan. Eat warm or package them up for storing. The cookies keep for 2 to 3 days.