Preheat oven to 180 ° Celsius and line a regular size cupcake pan with cupcake liner.
In a small bowl, measure out flour, sugar, salt, baking soda, baking powder, and cocoa powder, mix thoroughly with a whisk. Set aside.
Measure out the buttermilk, oil, egg, vanilla extract and red food coloring in a bowl and beat with a whisk. Combine.
Slowly pour the flour mixture into the liquid mixture while slowly whisking. Mix only until combine, scrape any flour on the side of the bowl and mix up anything at the bottom of the bowl.
Divide batter equally among 12 to 14 cups. (Depends on the cup size)
Bake for 18 minutes until an inserted toothpick in the middle of the cupcake comes out clean.
Remove cupcakes from the oven and let it cool.