1. Melt butter in a large saucepan over low heat. Add marshmallows and stir until completely melted and smooth.

2. Remove from heat. Add a few drops of red or pink food coloring gel and stir until you achieve a brain-like color.

3. Add Rice Krispies cereal, stirring until well coated.

4. Butter your hands lightly. Form the mixture into individual brain shapes. Use thumbs to create a central indentation and fingers to sculpt ridges resembling brain folds.

5. Place on wax paper to cool. Optionally, use black gel icing to draw squiggly lines for veins or other creepy details once cooled.

6. Serve immediately or store in an airtight container at room temperature.