1Preheat your oven to 350°F (175°C) and line a muffin tin with cupcake liners.
In a medium bowl, sift together the flour, sugar, baking soda, salt, and cocoa powder.
In a large bowl, whisk together the vegetable oil, buttermilk, egg, red food coloring, vanilla extract, and vinegar until well combined.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined and smooth.
Divide the batter evenly among the cupcake liners, filling each about two-thirds full.
Bake in the preheated oven for 18-20 minutes, or until a toothpick inserted into the center of a cupcake comes out clean.
Allow the cupcakes to cool in the tin for 5 minutes, then transfer to a wire rack to cool completely before frosting.