Method
1. Pre-heat oven - 175°C
2. Line 2 clean muffin pans
3. Add all purpose flour, cocoa powder, baking powder and baking soda to a clean medium bowl
4. Whisk briefly until combined
5. Add unsalted butter and granulated sugar to a clean stand mixer bowl
6. Cream together until light and fluffy
7. Add food coloring and vanilla extract to the batter
8. Mix well
9. Transfer dry ingredients to batter
10. Add egg to the batter and mix
11. Add buttermilk and apple cider vinegar to the batter
12. Mix briefly until just combined
13. Transfer batter to 2 muffin pans
14. Bake until skewer tests clean - 20 min, 175°C
15. Let cool completely
16. Frost with piping bag