Begin making a chocolate cake by adding to your mixing bowl your flour, granulated sugar, cocoa powder, baking powder, baking soda, and salt. Mix to combine.
In a separate mixing bowl, add buttermilk, vegetable oil, eggs, and vanilla. Mix to combine.
Gently pour your wet mixture into your dry mixture, while mixing. Stir until combined.
In a small saucepan, bring your water to a boil, once boiling, steadily pour your boiling water into your cake batter while stirring. Mix only until combined, set your cake batter aside for a minute.
Take your cake pans, and lightly grease the bottom and sides. Next, take approximately 2-3 tsp of flour into the bottom of each pan. Tap the sides until the entire bottom has a light coating of flour, dup any extra.
Pour your cake batter into your prepared pans. Bake at 350°F for 25-35 minutes, or until a toothpick inserted into the center comes out clean. Allow your cakes to cool to room temperature.