Preheat oven to 350° F. Line a cupcake pan with 12 cupcake liners.
In a large mixing bowl, whisk together all-purpose flour, granulated sugar, baking soda, cocoa powder, and salt.
Add in vegetable oil, egg, buttermilk, vanilla extract, white vinegar and red gel food coloring to the dry ingredients. Whisk the wet and dry ingredients together until they are fully incorporated. Do not overmix the batter.
Portion the cupcake batter into the cupcake liners with a large cookie scoop (3 tbsp batter) until about ⅔ full.
Bake the cupcakes for approximately 20 minutes or until the cupcakes bounce back when gently touched or an inserted toothpick comes out clean.
Remove the cupcakes from the oven and cool in the pan for a few minutes before transferring to a wire cooling rack to cool completely.