sq image focusing on a rice krispies brain on an old dirty wooden board with bloody splats
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4.6 from 5 votes

Rice Krispies Treat Marshmallow Brains

Everybody loves a rice krispies treat and these rice krispie marshmallow brains are a great no bake halloween treat. They are just perfect for kids! A great mix of gross and scary fun. Serve them up at your halloween parties or wrap them in cellophane and keep them for trick or treaters. Just don't forget to save one or two for the adults as I have found they love them too!
Prep Time30 mins
Setting time4 hrs
Total Time30 mins
Course: Snack, Sweet Treat
Cuisine: Modern Australian
Servings: 15
Calories: 87kcal
Author: Claire | Sprinkles and Sprouts
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  • 4 tbsp butter
  • 2 cups pink and white marshmallows - see note 1
  • 1/4 tsp salt
  • 4 cups Rice Krispies - see note 2
  • 1 tube red writing icing - optional


  • Line a large tray with non-stick paper
  • Place a pan on the stove and half fill with boiling water.
  • Put the butter and marshmallows into a heatproof bowl and set it over the boiling water.
  • Bring the water back to a simmer.
  • Let the butter melt and once it has stir occasionally until the marshmallows are completely melted and smooth (see note 3)
  • Add the salt and stir to combine.
  • Turn the heat off from under the pan and add the rice krispies to the melted mixture.
  • Gently stir until the mixture is well combined. It will seem like this will never come together but eventually it will all be coated.
  • Lightly oil two tablespoons (front and back) and use them to scoop and shape a mound, set the mound down onto your prepared tray and with lightly oiled fingers flatten to a rough brain shape.
  • Repeat until you have 5 'brains'
  • Lightly coat a table knife with oil and use it to press the central indent into your brain. Use your oiled fingers to hold the oval shape together.
  • Continue forming 5 brains and then doing the indents until you have used all the mixture.
  • Use the red icing to add spots or drizzles of blood to your brains.
  • Leave the brains to set for 4-5 hours.


  1. Use a mixture of pink and white marshmallows to give your brains a pink color. Standard or mini marshmallows will work fine.
  2. Any crispy rice cereal is fine
  3. Don't panic, as the marshmallows start to melt the mixture will look awful and like it is never going to come together, just keep heating and stirring occasionally and it will eventually become a smooth paste.


Calories: 87kcal | Carbohydrates: 14g | Fat: 3g | Saturated Fat: 1g | Cholesterol: 8mg | Sodium: 113mg | Potassium: 9mg | Sugar: 6g | Vitamin A: 590IU | Vitamin C: 4.7mg | Calcium: 1mg | Iron: 2.3mg
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