01 - Set up a brain-shaped mold or line a medium bowl with plastic wrap to form the brain cavity.
02 - Heat butter in a large saucepan over medium heat. Add mini marshmallows and stir continuously until completely melted and smooth.
03 - Incorporate red or pink food coloring drop by drop into the melted marshmallow mixture until achieving a realistic brain-like hue.
04 - Remove from heat. Fold in crispy rice cereal until every piece is evenly coated. Let mixture cool until safe to handle.
05 - Using buttered hands, press half the cereal mixture into the prepared mold, shaping up the sides to create a hollow center cavity.
06 - Spoon raspberry or strawberry jam and coulis into the central cavity, keeping it centered for even distribution.
07 - Cover the filling with remaining cereal mixture, pressing gently to seal. Shape the exterior to enhance brain-like texture and appearance.
08 - Let structure set at room temperature for 20 to 30 minutes. Carefully unmold onto a serving plate.
09 - Optional: Use food coloring and a small brush to paint detailed ridges and highlights. Decorate with candy eyes or sprinkles for extra spooky effect.
10 - Slice the brain to reveal the oozing berry filling and serve immediately.