1. Grease a large bowl and a 9×13 inch baking pan with butter or cooking spray. Alternatively, prepare a brain-shaped mold or small individual molds for shaping.

2. In a large saucepan, melt butter over low heat. Add marshmallows and stir until completely melted and smooth. Remove from heat.

3. Add a few drops of red or pink food coloring to the melted marshmallow mixture. Stir well until you achieve a desired brain-like color. Remember, you can always add more!

4. Pour the colored marshmallow mixture over the Rice Krispies cereal in the greased large bowl. Stir until the cereal is thoroughly coated.

5. Using greased hands, press the mixture into the prepared baking pan or molds. If making a large brain, gently shape it with your hands on parchment paper. For individual brains, shape small portions into brain-like lumps.

6. Allow the treats to cool completely and set, about 30–60 minutes, or refrigerate for faster setting.

7. Once set, carefully remove from the pan or molds. For an extra ghoulish effect, use black gel icing or an edible marker to draw squiggly ‘veins’ on the surface of your Marshmallow Rice Krispies Halloween Brains.

8. Serve your terrifyingly tasty brains and enjoy the screams (of delight)!