01 - Line a medium bowl with plastic wrap to create a brain-shaped form, or use a brain-shaped mold if available.
02 - Heat butter in a large saucepan over medium heat. Add mini marshmallows and stir continuously until completely melted and smooth.
03 - Add red or pink food coloring drop by drop, stirring until you achieve a realistic brain-like hue.
04 - Remove from heat and fold in crispy rice cereal until evenly coated. Let cool slightly until safe to handle.
05 - Using buttered hands, press half the cereal mixture into the prepared mold, pressing up the sides to create a hollow cavity in the center.
06 - Spoon the jam and coulis into the center cavity, keeping it away from the edges to prevent leakage.
07 - Cover the filling with remaining cereal mixture, pressing gently to seal. Shape the exterior to enhance brain-like texture with subtle ridges.
08 - Let set at room temperature for 20 to 30 minutes until firm. Carefully unmold onto a serving plate.
09 - Use food coloring and a small brush to paint detailed brain cell ridges. Add candy eyes or sprinkles for extra Halloween flair.
10 - Slice into wedges to reveal the oozing berry filling and serve immediately.