In the bowl of a stand mixer, combine the granulated sugar, cocoa powder, and vegetable oil. Mix on medium speed until fully blended and glossy.
1 cup unsweetened cocoa powder, 1¾ cups granulated sugar, ½ cup vegetable oil
Add the eggs one at a time, mixing well after each addition. Mix in the vanilla extract.
4 large eggs, 2 teaspoons vanilla extract
In a separate bowl, stir together the flour, baking powder, and salt.
2 cups all-purpose flour, 2 teaspoons baking powder, ¾ teaspoon salt
Add the dry ingredients to the cocoa mixture and mix on low speed just until combined.