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Preheat your oven to 350°F (175°C). Grease and flour an 8-inch round baking pan. Ensure the pan is evenly coated to prevent sticking.

In a large mixing bowl, combine the all-purpose flour, unsweetened cocoa powder, baking powder, and baking soda. Whisk these dry ingredients together thoroughly until well combined and no lumps remain. Set aside.

In a separate large mixing bowl, add the granulated sugar and vegetable oil. Whisk these ingredients together until they are well mixed and the sugar begins to dissolve slightly.

To the sugar and oil mixture, add the large egg, vanilla extract, and buttermilk. Whisk vigorously until all the wet ingredients are thoroughly combined and the mixture is smooth.

Add the white vinegar to the wet ingredient mixture and mix gently. The vinegar will react with the baking soda to help the cake rise and achieve its moist texture.

Gradually add the previously prepared dry ingredient mixture to the wet ingredient mixture. Mix on low speed with an electric mixer, or by hand with a whisk or spatula, until a smooth, uniform chocolate cake batter is formed. Be careful not to overmix, as this can lead to a dry cake.

Pour the prepared batter evenly into the greased and floured 8-inch round baking pan.

Bake the cake in the preheated oven for 25-30 minutes, or until a wooden skewer or toothpick inserted into the center comes out clean. The top should spring back lightly when touched.

Once baked, remove the cake from the oven and let it cool in the pan on a wire rack for 10-15 minutes before inverting it onto the wire rack to cool completely. This allows the cake to set and prevents it from breaking.


Preheat your oven to 350°F (175°C). Grease and flour an 8-inch round baking pan. Ensure the pan is evenly coated to prevent sticking.

In a large mixing bowl, combine the all-purpose flour, unsweetened cocoa powder, baking powder, and baking soda. Whisk these dry ingredients together thoroughly until well combined and no lumps remain. Set aside.

In a separate large mixing bowl, add the granulated sugar and vegetable oil. Whisk these ingredients together until they are well mixed and the sugar begins to dissolve slightly.

To the sugar and oil mixture, add the large egg, vanilla extract, and buttermilk. Whisk vigorously until all the wet ingredients are thoroughly combined and the mixture is smooth.

Add the white vinegar to the wet ingredient mixture and mix gently. The vinegar will react with the baking soda to help the cake rise and achieve its moist texture.

Gradually add the previously prepared dry ingredient mixture to the wet ingredient mixture. Mix on low speed with an electric mixer, or by hand with a whisk or spatula, until a smooth, uniform chocolate cake batter is formed. Be careful not to overmix, as this can lead to a dry cake.

Pour the prepared batter evenly into the greased and floured 8-inch round baking pan.

Bake the cake in the preheated oven for 25-30 minutes, or until a wooden skewer or toothpick inserted into the center comes out clean. The top should spring back lightly when touched.

Once baked, remove the cake from the oven and let it cool in the pan on a wire rack for 10-15 minutes before inverting it onto the wire rack to cool completely. This allows the cake to set and prevents it from breaking.
