Preheat your oven to 350°F (175°C).

In a large mixing bowl, whisk together the all-purpose flour, cocoa powder, baking powder, and salt.

In another bowl, mix together the granulated sugar, vegetable oil, and vanilla extract until well combined. Add the eggs one at a time, beating well after each addition.

Gradually add the dry ingredient mixture to the wet ingredients, stirring gently until just combined.

Cover the bowl with plastic wrap and chill in the refrigerator for about 30 minutes.

Once chilled, scoop out small portions of dough and roll them into balls. Roll each ball in powdered sugar until fully coated.

Place the dough balls on a parchment-lined baking sheet and bake for 10-12 minutes.

Let the cookies sit on the baking sheet for about 5 minutes, then transfer them to wire racks to cool completely.

Store your cookies in an airtight container at room temperature for up to a week.