Preheat oven to 350°F. Grease three 9-inch round cake pans with nonstick spray. Set aside.
Add the flour, baking soda, baking powder, and salt to a large bowl and whisk until combined.
3½ cups all-purpose flour, 2 teaspoons baking soda, 1 teaspoon baking powder, 1 teaspoon kosher salt
In a separate bowl, whisk the oil, sugars, and cocoa powder together. Add in the eggs, milk, water, and vanilla extract and whisk until combined.
¾ cup vegetable oil, 2 cups granulated sugar, 1 cup brown sugar, 1½ cups unsweetened cocoa powder, 4 large eggs, 2 cups whole milk, 1 cup water, 1 tablespoon pure vanilla extract
Add the wet ingredients to the dry ingredients and mix with an electric mixer until just combined.
Divide the batter evenly among the 3 cake pans (about 740 grams per pan).
Bake for 30-35 minutes or until a toothpick inserted in the center of the cake comes out clean. Let the cake cool for at least 10 minutes.