Preheat your oven to 350°F.
Grease and flour two 9-inch round cake pans.
In a large bowl, whisk together the flour, sugar, baking soda, salt, and cocoa powder.
In another bowl, mix the oil, buttermilk, eggs, red food coloring, vinegar, and vanilla extract.
Add the wet ingredients to the dry ingredients and mix until well combined.
Divide the batter evenly between the prepared pans.
Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
Let the cakes cool in the pans for 10 minutes.
Then remove them from the pans and cool completely on a wire rack before frosting.