Follow these easy steps to create your Chocolate Coffee Cupcakes:

1. Preheat the Oven: Preheat your oven to 350°F (175°C) and line a cupcake pan with paper liners.
2. Mix Dry Ingredients: In a large bowl, combine flour, granulated sugar, cocoa powder, baking soda, baking powder, and salt. Whisk until well combined.
3. Combine Wet Ingredients: In another bowl, mix the brewed coffee, vegetable oil, vanilla extract, vinegar, and eggs. Whisk until smooth.
4. Combine Mixtures: Slowly pour the wet ingredients into the dry ingredients. Stir gently until just combined. Be careful not to overmix.
5. Fill Cupcake Liners: Divide the batter evenly among the cupcake liners, filling each about two-thirds full.
6. Bake: Place in the preheated oven and bake for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
7. Cool: Remove from the oven and allow the cupcakes to cool in the pan for about 10 minutes. Then, transfer them to a wire rack to cool completely.
8. Prepare Frosting: In a large bowl, beat the softened butter until creamy. Gradually add powdered sugar, alternating with brewed coffee, and mix until smooth. Add vanilla extract and a pinch of salt. Beat until fluffy.
9. Frost the Cupcakes: Once the cupcakes are completely cool, frost them generously with the coffee buttercream frosting using a piping bag or a knife.