01 - Preheat oven to 350°F and line a 12-cup muffin tin with cupcake liners.
02 - Whisk flour, cocoa powder, sugar, baking soda, baking powder, and salt in a large bowl until fully integrated.
03 - In a separate bowl, whisk together eggs, whole milk, melted butter, and vanilla extract. Pour into the dry mixture and mix just until blended.
04 - Divide batter evenly among the prepared liners, filling each approximately two-thirds full.
05 - Bake for 18 to 20 minutes or until a toothpick inserted in the center emerges clean. Cool completely on a wire rack.
06 - Once cooled, use a small knife or cupcake corer to remove the center of each cupcake. Fill each cavity with about one teaspoon raspberry jam and replace the top.
07 - Beat room-temperature butter until creamy. Gradually add powdered sugar, then milk and vanilla extract, until a fluffy consistency is achieved. Tint frosting with pink or red gel food coloring.
08 - Transfer frosting to a piping bag fitted with a round tip. Pipe two squiggly lines on each cupcake to resemble hemispheres of a brain.
09 - Drizzle or dot extra raspberry jam over the brain frosting for a gruesome appearance, if desired.
10 - Present immediately for best texture and effect.