Combine all-purpose flour, cocoa powder, baking powder, and salt in a bowl. Mix together using a wire whisk. Set aside.
3/4 cup Cocoa powder, 2 teaspoons baking powder, 1/2 teaspoon fine salt, 2 1/3 cups all-purpose flour
Pour oil and add the granulated white sugar in a clean bowl. Beat using a hand blender (or stand mixer). Add the eggs one by one and vanilla extract while beating.
2 cups granulated white sugar, 3/4 cup vegetable oil, 4 eggs, 2 teaspoons vanilla extract
Gradually add the flour mixture while beating and continue to beat until all the ingredients are well incorporated.
Cover the bowl with a cling wrap. Refrigerate for 8 hours or overnight.
Preheat oven to 350F. Scoop 1 tablespoon of mixture and roll it into a ball. Roll the ball in a plate with powdered sugar.
1/3 cup powdered sugar
Put a parchment paper over a baking tray or cookie sheet. Arrange the coated balls o the baking tray with enough space apart.
Bake for 10 to 11 minutes.
Remove from the oven and let it cool down by placing in a wire rack.
Enjoy!