Grease a bowl or dome-shaped mold generously with butter.

In a pot over low heat, melt four tablespoons of butter. Once smooth, add four cups of mini marshmallows. Stir frequently until the marshmallows are completely melted and creamy.

After melting, remove from heat and stir in pink food coloring until a brain-like hue is achieved.

Add six cups of Rice Krispies cereal to the marshmallow mixture and gently fold until all cereal is coated.

Press the mixture into the greased dome mold, shaping it into a brain form with ridges.

Let the treat cool completely for about 15-20 minutes. Once cooled, unmold it and carve brain-like grooves into the surface.