Whisk flour, sugar, cocoa, baking powder, baking soda, and salt.
Whisk buttermilk, oil, egg, and vanilla in a separate bowl.
Combine wet and dry ingredients.
Add hot coffee; batter will thin.
Fill liners and bake 18–20 minutes.
Cool completely.
Frosting
Frosting
Beat peanut butter and butter 2 minutes.
Add powdered sugar and vanilla.
Add heavy cream and whip 2–3 minutes until fluffy.
Pipe onto cooled cupcakes.
Notes
When it comes to the nutrition information provided for recipes, it’s important to keep in mind that it’s just an estimate. The actual nutritional values can vary based on the specific ingredients and brands you use. Be mindful that any nutritional information provided is intended as a general guideline rather than exact values.
Storage
Store at room temp 2 days or refrigerated up to 5 days.
Notes
Coffee deepens chocolate flavor. Frosting can be doubled for taller swirls.