Preheat your oven to 350°F (175°C). In a mixing bowl, whisk together all-purpose flour, cocoa powder, baking powder, baking soda, and salt.

In another bowl, combine the large egg, milk, vegetable oil, vanilla extract, and granulated sugar until smooth. Gradually fold the wet ingredients into the dry mixture, stirring gently until just combined.

Line your cupcake pan with liners and fill each one about two-thirds full with the batter. Bake for 18-20 minutes until a toothpick comes out clean.

Once baked, let them cool in the pan for a few minutes before transferring to a wire rack.

Once cooled, cut a small cone-shaped piece from the center of each cupcake and fill with strawberry jelly, allowing it to spill slightly over the edges.

In a large mixing bowl, beat together the softened butter and marshmallow fluff until light and fluffy. Gradually sift in confectioners' sugar and add salt.

Using a piping bag, frost each cupcake. Add jelly “fangs” and sprinkle with crushed chocolate graham crackers.

Serve your spooky Vampire Cupcakes arranged on a platter for the festivities!