Mix butter and sugar until fluffy.
Add eggs one at a time.
Pour in milk and vanilla.
Combine flour and baking powder separately.
Fold dry ingredients into wet mixture.
Grease the brain mold thoroughly.
Pour batter into the mold evenly.
Bake at 350°F for 35 minutes.
Check doneness with a toothpick.
Let it cool for 15 minutes.
Remove cake from mold carefully.
Add pink coloring to frosting.
Pipe frosting to create brain wrinkles.
Add red gel for blood effect.
Refrigerate for 30 minutes before serving.