01 -
Preheat the oven to 175°C. Line a 12-cup muffin tin with black cupcake liners.
02 -
Sift together flour, cocoa powder, baking powder, baking soda, and salt in a large mixing bowl. Whisk to combine.
03 -
In a separate large bowl, beat softened butter, granulated sugar, and brown sugar with an electric mixer until light and fluffy, about 2–3 minutes.
04 -
Beat in the eggs one at a time, followed by the vanilla extract, ensuring the mixture is smooth.
05 -
Gradually add dry ingredients to the butter mixture, alternating with buttermilk, starting and ending with dry ingredients. Mix until just combined, without overmixing.
06 -
Fill liners two-thirds full with batter. Bake for 18–20 minutes or until a toothpick inserted in the center comes out clean. Cool cupcakes on a wire rack completely.
07 -
Heat raspberry jam and red gel food coloring in a saucepan over low heat, stirring until smooth and vivid. For thicker consistency, dissolve cornstarch in 1 tablespoon water and stir into the mixture. Allow to cool.
08 -
Once cupcakes are cool, use a corer or small spoon to remove the centers. Fill a piping bag with the jam filling and pipe into the cavity of each cupcake. Replace the removed cake tops to conceal.
09 -
Beat softened butter until creamy. Gradually incorporate powdered sugar at low speed, then add vanilla extract and 2–3 tablespoons heavy cream or milk. Mix until the frosting is smooth and fluffy.
10 -
Pipe buttercream onto cupcakes using a piping bag and preferred tip. Drizzle or splatter red gel food coloring over the frosting to mimic dripping blood. Garnish with edible vampire fangs if desired.