Preheat the oven to 350F. Spray three 8-inch cake pans with baking nonstick spray. Line the bottoms with 8-inch parchment paper circles and spray again.
In a large bowl, sift the flour and cocoa powder. Add in the sugar, baking powder, baking soda, and salt.
2 ½ cups All-purpose flour, 1 ¾ cup White granulated sugar, 1 cup Unsweetened cocoa poweder, 2 ½ teaspoon Baking powder, 1 ½ teaspoon Baking soda, 1 teaspoon Salt
Start heating the water on the stove until streaming. In a separate bowl, mix the oil, vanilla, eggs, and buttermilk. Slowly add in the hot water. Make sure to add it in slowly to not cook the eggs.
¾ cup Oil, 1 teaspoon Pure vanilla extract, 4 Large eggs, 1 cup Buttermilk, 1 cup Hot water
Pour the wet ingredients into the dry and mix until just combined. Pour the cake batter evenly into the three cake pans.
Bake the cakes for 25-28 minutes. Bake until toothpick inserted comes out clean.
Let the cakes sit in the hot pans for 10 minutes. Then, transfer to a cooling rack to cool completely.