Preheat the oven to 350°F (175° C). Line a muffin pan with 12 cupcake liners.
In a small bowl, whisk together flour, sugar, cocoa powder, baking soda, baking powder, and salt.
In a medium bowl, whisk the egg, oil, and vanilla extract until well combined.
Add the dry ingredients and fold the batter until just combined.
Scrape the sides of the bowl, add hot coffee, and mix again until just combined.
Divide the batter into the prepared cupcake cups halfway full.
Bake for 18-20 minutes or until the inserted toothpick comes out clean. Cool completely.