Sift the flour and cocoa powder together into a large bowl. Add granulated sugar, baking powder, vanilla, and salt, then whisk briefly to combine.
150 g all-purpose flour, 50 g unsweetened cocoa powder, 200 g granulated sugar, 1 tbsp baking powder, ½ tsp vanilla, ½ tsp salt
Add eggs, milk, and canola oil, and stir the batter together with a wooden spoon. Finally, add hot coffee and stir until the batter is smooth.
1 eggs, 100 ml milk, ¾ dl canola oil, 100 ml coffee
Divide the batter evenly among 12 muffin liners in a muffin pan. Bake at 180 °C (356 °F) for 15–17 minutes, or until a toothpick inserted into the center comes out clean.
Remove the cupcakes from the muffin pan and let them cool completely on a wire rack.
Chocolate buttercream:
Make the chocolate buttercream according to the recipe. Add black gel food coloring and stir until the color is evenly distributed.
1/2 batch of my chocolate buttercream with cocoa, Black gel food coloring
Fill a piping bag fitted with a large star tip with the buttercream.
Royal Icing:
Stir powdered sugar, cocoa powder, and egg white together in a bowl until you have a smooth glaze thin enough to pipe.