Start by preheating your oven to 350°F. Line a baking sheet with a silicone mat or parchment paper to prevent sticking.
In a small bowl, mix together the flour, baking powder, and salt. Set this mixture aside for later.
In a medium bowl, combine the cocoa powder, granulated sugar, brown sugar, and oil. Mix well. Then, add the eggs one at a time, beating well after each addition, and stir in the vanilla.
Gradually add the flour mixture to the chocolate mixture. Stir until everything is nicely combined. Cover the bowl with plastic wrap and pop it in the fridge for about 30-45 minutes to firm up the dough.
Once chilled, use a cookie scoop or your hands to shape the dough into 1 ¼-inch balls. Roll each ball in powdered sugar until well coated. Place them on the prepared baking sheet, leaving about 2-2 ½ inches between each ball.
Bake in the oven for 10-11 minutes. When they’re done, let the cookies cool for about 2 minutes on the baking sheet before transferring them to a wire rack to cool completely.